I joined the club, registered, and completed the necessary steps (yahoo sent me the details via DM). Then, I received $20 in play chips and enjoyed an amazing 30 minutes playing NL Hold'em.
My opponent was unbelievably lucky, catching ridiculous outs on the river several times and completely crushing my spirit. By the time my morale dropped, I’d lost the entire balance. 

I also noticed that every 10-30 hands, a random "bomb" would drop at certain tables, multiplying the pot. When the bomb drops, players get noticeably more aggressive.
I might make a deposit to play for fun and test out the withdrawal and deposit process. Overall, I really enjoyed it.