I have an r3 pro, a lot of xray parts are interchangeable, notably the arms according to many. But honestly the price of blaze replacement parts even with HK shipping comes in lower than the orange stuff. You can rebuild it twice with the shipping costs included for just the price of a t4 kit, I generally throw extra parts in each order until I see the shipping cost increase so I can build a stock of backups.
I Can attest to it's decency, I am a terrible driver and have bounced it off a lot of barriers. Did bend one piece after 3 weeks of racing, but a pair of them with shipping was cheaper than the equivalent xray part from amain.
With a basic setup, and a justock 21.5 it goes fast enough, tracks well and is responsive enough to make it clear that my driving skills are the weakest link.