I'm kind of repeating what I said on some thread about Winslow ligatures, but I've found the Olegature to be really excellent, and though I've never been a real equipment freak to begin with (too expensive, and YOU are the one in charge of your sound), I'm satisfied enough that I don't feel any need to look for anything else. Of course, maybe you could ignore what I say exactly because I haven't tried hundreds of different ligatures.
I bought one (for $60+ from WWBW in 2000 - how cheap is the one you're looking at?) because I saw a lot of very good, very experienced players switching to them. In short, I'd say buy it - it does a good job, and for God's sake, it's just doing the job of keeping the reed in place without screwing up anything else or choking off the reed vibration.
Incidentally, if you do buy it, make sure to put a little tape (like gaffer's tape or something with a little thickness and texture) on top of your mpc. so the ligature doesn't slip around - that can be an issue, especially if the mpc. is tight on the neck.