I have Fresh 2.0b2 running on my phone. Visual Voicemail doesn't work, but I have Google Voice for that. I think there might be an issue with the stock messaging app's notification LED, but I use Handcent and it works fine. The phone showed that I had 4 voicemails, which I didn't, but I went into Settings -> Call and reset the count and then put my own # in as the VM #, and it's fixed. This also enables old-school voicemail so you can hit '1' and get to your VM's. Oh, there's also an article about using *#*#3646#*#* to lock your phone to CDMA-only so it's not hunting for GSM or something like that, might increase battery life.
Every now and then I can't slide the lock screen down, but I just hit Menu twice anyway to unlock the phone.
This ROM runs so fast it's hardly believable. With the old processor in the Hero, I never thought the phone would be able to do what it does. Before, with Stock ROM or Fresh 1.1, the phone was so laggy while typing and general use, I wanted to get another phone. Now, everything is ridiculously fast. Calls pop right up on the screen, texting never lags, and multitasking is a genuinely pleasing experience. Hell, it connects outbound calls about 3x faster even.
I highly recommend this ROM.