Quick update:
So it's been about a week and a half now with the Epic. So far, it's been pretty good.
Comparing the Epic to the Transform...it really is no comparison. It's such a huge difference that I can barely believe they are both made by the same manufacturer.
Comparing the Epic to the Evo is a bit harder. I do find more bugs in the Epic at the moment...but the Epic is still on 2.1 compared to 2.2 on the Evo. I'm sure a lot of those bugs will be taken care of with the eventual Froyo update. As stated by someone above...the Epic does seem to have a harder time connecting the our Airave than my Evo does. I'm not a fan of the hardware keyboard, but my girlfriend loves it...she never uses the touchscreen keyboard. I am going through serious Swype-envy though. I had a beta version installed on my Evo at one point and it really wasn't that great...nothing like the ridiculously fast and smooth typing experience Swype is on the Epic. As for the screens...while the Epic's screen does look really nice, I think I prefer the bigger screen of the Evo simply because of the extra screen real estate.
As for bugs, I've noticed a handful of minor ones...and two fairly big ones. The well-documented GPS bug is present on her Epic....it's pretty much useless for GPS compared to my Evo. Another one that I didn't see though...it seems that the camera flash is timed incorrectly. Does anyone else have this problem? When taking a picture with the flash...the flash does go off, but it does so well before the actual picture is taken...so in the actual picture, it still looks dark as if there was no flash at all. Also, I don't know if this is related or not, but can the flash for the camera be used as a flashlight? I can do it on my Evo, but I was surprised that it didn't work on the Epic. Any thoughts on the camera flash issue? Taking picture with a phone is something that my girlfriend is far more interested than I am with my phone...I would love to figure out this flash issue so I can stop having to pull my Evo out each time we're out with friends just to take a picture for her....especially because the Evo takes absolute horrible pictures with the flash on (they're completely washed out because the flash is too bright).