I just ordered a pair of SVH custom skates yesterday with the holders unmounted. I plan to put CCM XS holders on them when they arrive for 3 reasons.
I have 3 sets of great DLC steel in 304 mm (the size I need) from my son's skates that he just came out of that had less than 3 months of use. 2 are Bladetech and 1 is Step Blacksteel. He and I use the same profile / sharpening radius and the Bladetech are profiled and sharpened perfectly for me now and should last at least 2-3 years in a rotation, and that's if I don't get the Step Blacksteel profiled to match them as a backup set.
Durability. I've had issues as a large guy (6'4" / 220 now...but a lot heavier in the past) with the Edge holders on Bauer skates. My current Edge holders are the 2nd set on a pair of pro stock MX3s that were brand new skates a few years ago. I got the skates about 2 years after intro to the market after they'd been sitting in a team equipment room unused, so they're not really quite as old as the MX3s really are, and I only really got about 2-3 years out of the 1st set of Edge holders before I had to replace them because I kept having steel pop loose.
Steel availability - Should my skates outlast the 3 sets of steel I have, I want to have more options for replacement at decent prices, and the XS holders offer that. With the Edge holder going away soon, higher end steel may start to become limited in options.
Now just to decide who I want to have mount the skates, because I'm not sure I want the place I ordered from to do the mounting for me...but the one guy I really trust is 700 miles away...I guess I have to see if I can get them baked / molded without holders, let them set for a couple of days, and then ship them off to him to mount the holders and profile that set of Step Steel to match my Bladetech. Of course, then there's the whole idea of mounting holders without me there to ensure they are 100% centered where my balance points are. So many variables!!!!!