Been using it for the last hour or so and so far it has been pretty spotty. I know this is BETA, but i have had 4 force closures attempting to get to the now playing tab. The stream seems slow right now, but that could be my network. I can't find access to my library yet...but i am assuming that i can just create a playlist from my library to correct...i digress.
Point is, i LOVE grooveshark but this app for me needs some definite work before i would call it a release...which is why it is beta. What i do konw about grooveshark is that they always have released a quality product and their support is responsive and stellar. I am certain that given some excellent constructive feedback, Grooveshark devs can create a online radio/personal radio killer app.
Keep up the good work grooveshark.
EDIT: I have noticed that the more i am using the grooveshark app today the better it is getting. It started out very rough, but it has been strong for about 10 songs now.