I am constantly blown away by my XSs. I have them in both x and z plastic, and they have an ideal flight pattern (similar to the teebird I believe). They're great for hyzer-flips, long turnover drives, and the Z-plastic will even give a pretty nice S-curve.
I'd very highly recommend them. It's a great place to start to learn how to use different distance lines on your drives. I throw mine 300-330 very consistently, and have seen other people really bomb them.
The X plastic is also WAY more durable the innova's DX. I launched a drive today and just as the disc started to flex out it tagged a tree dead center. I could see the disc almost fold in half. When I got up to it though, there wasn't even a mark on it. I was blown away, the next tee when I threw it, the flight path had hardly changed at all.
I can't recommend this disc enough.
If you want something more overstable, you could always try the Avenger (more controllable in X plastic), but I think the XS is way more versitile.