The only problems I've had with LW has been those annoying NEED MORE SOURCES/AWAITING SOURCES messages that I'm sure everybody gets from time to time. It gets to be VERY annoying when I'm trying to find certain songs I want. I keep searching and searching for those songs, only to get the same two messages.
Finally, I just give up in disgust and find other songs that have more sources.
Other than that, I find no reason to cancel my account with LW since I see it as a reliable source of music, and I have downloaded numerous songs in the past several months.