Are you talking about the HTS3400 or the HTS3500? The HTS3400 is $350 and the 3500 is the one that's $250.
Anyway, I recently bought a Yamaha HTiB and before I did I read a lot and looked at the Yamaha and comparable Onkyos. The HTS3500 was one of them. Out of the brands and models I looked at, every single one had reported issues of one type or another but overall most people seemed very happy with all of them. The Onkyo also looks like it's more popular than the one I bought. For me I preferred some of the features of the Yamaha but I would have been happy with the Onkyo too. Based on the reviews, I think you'll be fine unless you have the bad luck of being one of the few that has some kind of problem. But most people aren't reporting any problems. Fortunately Amazon has a very good return policy so I'd say give it a try, hook it up, and make sure it doesn't have any of the reported problems you read about.