ONLINE renting game? GOOD THING or BAD THING?

Hi there, i have a question about renting games from online? First of all, i know that you can rent games from blockbuster but i heared that not alot of ppl are going to blockbuster anymore. And i dont wnat to buy a new game that's cost $65. I found a website call ( http://www.gamefly.com/ ), it's a online renting games but i never heared of that website before, is it trust able or just another fake websites? or should i stick back to Blockbuster?