Their stuff is top notch quality. I have one of their 7.62x39 barrels and I can shoot one ragged hole 5-shot group at 100yds with factory Hornady 123gr SST ammo. Their 6.8 and 5.56 is extremely high quality as well. Just look at 68forums and everything they have to say about his stuff. It is a good way to go for your first upper because it is such high quality, it will last you a very long time.
I'm an advocate for assembling the rifle yourself, so you can get exactly what you want. But if this is exactly what you want, you couldn't have chosen/built better.
If you are on a budget and this is a little steep, check out Del-ton and JSESurplus. They have a few nice uppers as well to choose from. Good luck!