I started out with *decent* signal at first (fewer bars than my EVO, but I assumed it was just this had more total bars to fill), but it has declined more and more. Now I have 1 spot on my desk at work that texts will actually send at, even if I have 1 bar at other spots (the spot jumps up to 3 bars).
At home, my signal is also degraded since I first got my phone. I use wifi at home, but it doesn't stay connected once my screen goes off, so I have to turn it off and back on each time, and for some reason I can't connect to the market when using wifi, so I have to update off the weak and slow signal if I need to update or download apps.
The phone is great, and hopefully they do fix the signal issues (and soon) otherwise I'm starting to feel like this was a $200 waste of money sadly...
*edit*
Also I'd like to mention my girlfriend has the original Epic, and her signal is fine at home.