It's an interesting feeling. I have a lvl 10 Titan that has been fun to run around with, and was really helpful picking up craploads of Spinmetal when he was leveling up. But in the end, it really doesn't feel any different than playing with my Warlock and that's why I think I'll level it very slowly. I played WoW a LOT and had tons of alts and played them all so I'm not "alt" adverse at all. There just isn't any flavor between the different classes. With WoW it was leveling a whole new character, class, starting area, etc - it was very unique. With Destiny I'd only want to do that to do more dailies and grind, which I really don't have time for for just ONE character. I like alts when they are "different' than your main and there just isn't enough difference between Destiny classes to make it worthwhile for me, especially when the "origin" stories and everything are all the same. And I've done all the missions multiple times because repetition so it's like, "Yeah, let me do all these quests AGAIN except this time I do less damage... yay..." $.02