It's okay. Slow shipping is definitely an issue, and the prices aren't favorable if you're not a really big gamer that doesn't need to own their games. Otherwise I have a hard time justifying one game out a time prices, as within two months of that, I could just flat out buy a game with the money I saved from not using the service. In no way is this comparable to the likes of Netflix in terms of good pricing and good service, nor does it compare to the once great local rental programs of various stores long out of business.
As others have said, I suggest trying the one month trial. At that point, if you feel it's worth it and you aren't just better off saving up for games, go for it. Just remember to be efficient, otherwise you're wasting money if you decide to get a subscription.