17, going on 18 in about a week or so.
I'm satisfied with it. Its not top of the line, but it does everything I need/want it to. When you try to find faults in things, rather than look at the benefits, you tend to be a lot more unsatisfied. For me, the benefits outweigh the faults. The pure functionality and quality outweighs the occasional lag and poor battery life. But I was aware that this phone was going to be slower, since its a bit dated, and the battery life was partially because its a CDMA phone, rather than the more battery friendly GSM, and that it had a smaller battery than my Nokia E63 (but that phone also has one of the best smartphone battery lifes of any phone produced). Also, the fact it will have an always on internet connection. But the battery thing can be easily fixed by buying a bigger aftermarket battery.
I had never had a data plan before, and I think its the coolest thing since buttered toast. I take real advantage of it, making the $30 charge worth it. And the Eris really takes full advantage of it as well. And since there is really good coverage here in town, the connection is pretty speedy with a 2Mb download speed sometimes. I think I'm almost addicted to it.
Besides that, if I could live with a laggy Razr for a year and half, I think I can live with a slightly laggy Eris that does literally 400x more things and actually is a competent phone.