I'm not a fan of Ovation acoustics unless you're standing and playing one with a strap, and even then, I'm not really that much of a fan. I just personally don't care for the way they sound. Those roundbacks are a b!tch to play sitting down. They slide off of you. At least they do me. I've had a Yamaha fgx412c-12 12 string for about 20 years. I love the sound of it, and I love playing it, but I rarely do. If I'm going to play acoustic I grab my Taylor, and if I want to play a 12 string I grab my electric Gretsch that I recently purchased. As far as string changes, I use Elixirs on my acoustic 12, and I think they're about $20-$25 or so. Like most guitars, keeping it in tune really isn't a problem as long as it isn't a total piece of crap.