value is realative to who you ask, as well the acessories, sights and etc that arte the gun. personally a stock xd .40 service model is worth more to me than MSRP. 17,000rds and still going strong, multiple training courses, eats everything i feed it, accurate, and easy and fun to shoot.
now the pistol would be of less value to me than a standard xd just to me personally, and this is why.
1) i prefer the 4" service models
2) i don't like/ have a need for adjustable sights/ fiber optic on my handguns.
3) i don't like trigger jobs on fighting guns.
however if this is a competition set up it should be good to go.
the grip tape is nice, and i have experimented with it and used it a bit on my xd, the 3m outdoor step tape to be specific, the mag funnel is nice too.
the overall value depends on the person as well as the context in which it is used. i think that you made a great trade, the pistol type ar's are ridic IMHO so you did well, and i would have made that trade in a heart beat!