I received my IAD kit on Wednesday and replaced the sound card last night (Thursday).
Overall, everything went very well but I did not get the chance to audition the upgraded sound card.
Going through the instructions, I had an issue with Step 8 (see below). When it came time to install the T10 screw in the "elevated" bracket of the IAD (red circle), I could not find a single screw that was long enough for the installation. However, I did noticed that with the two T15 screws (yellow circles) the new sound card is well secured, so no big panic.
One suggestion I had for Bryston, when putting together the kit (very nice kit), is maybe mark the bags with the screw sizes since I really do not know what a T10 or T15 screw looks like.
By the way, I also had some grief with the Phillips screws on the XLR connector. Maybe these should be replaced by either Torx screws or Robertson screws since they are real tinny and need a good grip to be reinserted into the new XLR connector.