I've had my tillies for about a year or so, now. I lost most of mine, though; some succumbed to cold damage (they suffered a bit on the shipping to my house during the winter), under watering and overwatering. I'm realizing that different tillies have VERY different needs in terms of water. Some are okay with a good soak, others aren't.
Without looking to verify, I believe the three I have left are 2 ionanthas, 1 velutina, and 1 medusa.
I'd love to get some other varieties now that I'm getting a better feel for them. The four that I have remaining are growing to a good size, which is encouraging and makes me want to get some different varieties that might contrast nicely, such as the more silver colored varieties and/or some that are fuzzier.