It's worth it. I played in one last week and trying to qualify this week as well.. The 30 minute levels are nice, and the competition is really soft. There's usually like 170-200 people playing for 2 seats, but this is deceiving, you have better odds because it will get down to like 100 people pretty quick, and you can wait for hands..

Las week I sat out for at least 2 hours (Family stuff) and still managed 14th.. only adjustment you have to make is to play to win, I was much more willing to go bust on a semi-made/questionable hand if it meant I doubled up.