From what I saw in Linus Tech Tips' overview of the device and accessories it seems like the hardware is solid but a little expensive. So if the price doesn't bother you and you're actually going to use it for gaming it should be a solid purchase. The only thing they didn't like in that overview was the desktop dock experience. But I'd say that's more a symptom of Android not being well suited.

I would caution you though that if you think you might want some of the accessories you should buy them up front. If you wait a year down the line these specialty accessories may no longer be available. It would be great if this became a standard ecosystem for portable gaming devices but the reality is that a lot of these specialty products don't get a refresh if sales numbers are low.