I own all three and like them, but I mostly play my drums in live. Topograf feels a bit like cheating for me if used for the whole drumset, but it's really good to trigger rhythmic stuff, not only kick and drums. It has this nice euclidean mode too. Cool stuff possible with the cv in. It's also fun to use if you want to jam along without any other gear in combination with the other two of course.
Drumkit 10: could have some more samples or the option to load some in but it's good. I use it more often than the kick. I like the lofi sound.
Kick: It's a kick? Didn't use it enough to say a lot.
I've ordered the Kick & Topograph, my thought is to do the snare with the AE itself, and should have enough modules to do the bass as well - seriously looking forward to that. I'm thinking weird bass lines coming from one of the Topograph triggers. :-)
I'll report back one day, although been really rubbish at spending time in the studio this summer to give more feedback to this forum, (or complete songs).