20.
There was a period of time where I was absolutely frustrated with the phone's lag and then the 2.1 BS. But now, the latter seems irrelevant, and promising...if you like bugs galore.
I was expecting too much out of the phone. Usually I get the latest and greatest to stay ahead of the pack and be well-off in the long-term until I have to buy again. The Eris was a fail for me for only that reason. It wasn't the best, but it was my fault for pinching pennies.
I'm fine with the phone now. Fixed all my issues with minor settings tweaks (some that aren't listed in the thread designed for them) and ATK. Believe it or not, leaving 3G on all the time (WiFi off all the time) has helped me, for some reason.