is fast growing trees actually decent quality for the price and any coupons before spring planting season

I am planning on planting 6 ornamental trees next spring to fill out the back boundary of my property. Fast Growing Trees is the only site that offers the best selection best selection as compared to the nurseries in town where everything is sold out. However, I am a little bit skeptical about their shipping policy as far as size/price is concerned.

Has anyone ever bought the trees from them? If yes, did they survive after the second year? Also, the size received is equal to the one advertised. Lastly, do they have any coupons/spring pre sale deals? Their prices fluctuate all the time!