Huel is the only one I've tried, and I've liked it enough. The flavour is not great by itself (a sweet, malty vanilla flavour for the flavoured one, which is a little weird but fine), but I tend to blend in ice and coffee or fruit (bannas and blueberries, raspberries, all work well). The flavour packs they sell didn't do much for me, they seemed too sweet for my taste (I didn't try them all though).

The other big thing I found was the texture improves a lot if blended or left in a fridge for a time before drinking. Shaken and drunk straight away the texture isn't great.