As a convinced vegan and animal rights supporter, I appreciate that Jake (and some other nutritionally complete food brands like Mana) does not have a non-vegan version. In my view, there is really no need for animal products, and if some people who would not eat something vegan otherwise do so because they have found a convincing nutritionally complete product that happens to be vegan, this is good for animals and the environment. Just for the personal need of vegans, it would be enough if there is a special vegan version (as this is, for example, the case with Betrand or Genesisfoods), but on the whole, I think it is even better if all versions are vegan.
I use nutritionally complete food as my main nutrition on week days when I work (preparing food myself everyday would not really be an option for me, that would be too much of a hassle, the alternative would have been expensive vegan restaurants or cafeterias), on the weekends I generally prepare pland-based whole food meals myself (except when I am very busy). I tried out a lot of different brands of nutritionally complete food. The ones I like best are Jake and Mana (I also like Feed., but I have not tried a lot of it).
I have successfully lost quite a lot of weight (from 96 to 76 kg in the four months since the middle of March, my height is 1.81m). Nutritionally complete food in general has been very helpful because otherwise, I would find counting calories an extreme nuisance. With products like Jake, it comes naturally and does not require much special effort.
I used a vegan ketogenic powder from Genesis Food Solutions (it might be a suggestion for Jake to offer something like that, as well). While I think that it really helped me accelerated weight loss, and I used it for about two months, I somehow don't feel too well on ketosis (some people say that the problems are mostly during the transition period, but I think I would not want to be in ketosis in the long term - I don't feel terrible, I think I adapted relatively well, but not I want to leave ketosis).
After having quite a lot of weight, I now want to continue for some time consuming relatively few calories (to lose a little more weight, but mainly in order not to regain weight). I highly appreciate that - in contrast to most other brands of nutritionally complete food - Jake offers products that give all required amounts of nutrients with a smaller amount of calories - with Jake Light and Vitaminbar.
I particularly appreciate Vitaminbar. I have no problem with consuming a significant amount of my food in liquid form, but I still prefer if there is also something solid. I find that the Vitaminbars are quite satiating despite the amount of calories that is quite low.
Although that might be controversial for some people, I think it is both a problem if a product is not tasty enough and if it is too tasty (superpalatable). If something I intend to consume regularly in order to get my nutrients is not tasty, at all, I don't feel well, and it becomes difficult to stick with that product. If it is too tasty ("superpalatable"), I get cravings, and especially when sticking to a low calorie diet, I think about when I am going to consume the next portion all the time. I had this problem with the vegan ketogenic product from Genesis Food Solutions. Some of the sweet tastes were so supertasty that it was hard for me not to think about when I am going to take the next portion, while the unflavored version lacked taste so much that it was really unpleasant. Finally I started mixing the versions with taste with the unflavored ones to get something in the middle. That helped, but it makes it more complicated. I think Mana and Jake (both powder/liquid and Vitaminbar) really have got this right, I generally get a slightly pleasant feeling when consuming it, but it is not so superpalatable that I get hooked (not even when I consume a low amount of calories).
I think the taste of Jake (and Mana) is almost ideal - it is pleasant without being so superpalatable that it is addictive and I consume too much - to such a degree that I don't miss a variety of different tastes, and I don't even like having to choose between different tastes. However, if different tastes were added, I would be particularly excited if there were non-sweet tastes. It somewhat bothers me that almost all flavored nutritionally complete foods are sweet (luckily for my taste, Jake and Mana are only slightly/mildly sweet, not too much). I have only tried it once so far, but I really liked savory versions of Feed.(Feedsmartfood) with vegetable taste. I do like the mild slightly sweet taste of Jake, but I get tired of this when some brands of nutritionally complete food offer a larger number of tastes, but all of them are sweet - I would highly appreciate something like a savory vegetable taste and other completely different tastes. I would still sometimes want to use the mildly sweet version (better if it is not too sweet), but I don't want to eat something sweet all the time.
I like the one-meal packages. I know that this leads to more waste than if there was powder for more than one meal in one package, but on the whole, I think I have rather less packaging than with other types of food, and I like when it is very easy and I get the right amount of powder automatically.