First of all, the quality is really stunning, it's one of the best rep I have ever seen. It won't need any mod for me, the date wheel font is maybe not as bold as the gen put I will keep it like this. AR is perfect, and the movement works great. The CG looks good and the lever is tight.
I've only replaced the strap for this nice OEM black carbon one as the one provided with the watch was the usual bad quality croc stamped. The deployant buckle is the new one, far better than DSN one.
As predicted, the caseback is WRONG for a 250 (serial is 451/500 and should be ????/2800) but that won't be a big problem.
Here are some pics: