I just filed with Studiotax last night as a matter of fact! I've been using it for two or three years now and like it. I find it really easy to use - it guides you through in a very step-by-step way. It also does a really good job of linking two returns (me and my boyfriend) in a way that is easy to read, which some programs seem not to. I got ours done start to finish in around 10-15 minutes last night.
I don't think there's really a right a wrong answer - everyone seems to have a tax program that they find easiest to use. Out of the options I've tried (Ufile, TurboTax, H&R Block, Studiotax, Simpletax, paper-and-pencil), I find Studiotax the best.