I've only been to 1 so far, which was back in March, though I was talking to my roommate from this past year about going to more over the summer. I lost both my sets, though I did win a game in each set, so I was satisfied. It's not too helpful when you have pretty much no experience against most tourney characters. Going into the tourney, I'd played maybe like 1 game ever against MK, 1 game against Snake, 1 against DDD, 0 against Diddy, etc. I have played plenty against Marth, since my roommate mains him, but I lost to Marth anyway in my 2nd set.
But yeah, I'm hoping to get money for a wii (since, due to the end of the semester, I have lost access to my roommate's wii, which I'd been using since Sept.) at some point this summer and get some wifi action, just to face more characters than like, Marth and Zelda. That and go to more tourneys.