I received my 42mm adapters today from freedomclock09 on eBay. I was setting up to do a full review, but I had issues with both adapters sets. I ordered the Spring Bar style and Apple Watch Bar style in Grey/Black to go on my Space Grey SS. The Spring Bar style matches the SBSS very well in color and the Apple Watch Bar style matches the SGS better, but looks ok on SBSS.
The main issue I have is with the Apple Watch Bar style. One of the adapters arrived with one partly stripped screw and the other screw is lock-tighted in so neither screw can be removed. The screws on the second adapter were removable, but they arrived screwed in at a slight angle, so they don't go back in all the way. I've asked for an exchange or refund and I'll see what happens.
UPDATE: fredomclock09 is sending me a replacement and told me to keep the damaged goods.
The issue I have with the Spring bar adapter is the size of it. It only works for thin leather straps. I have a custom Strap that is a little thicker than some leather straps, however it isn't unusually thick. I was going to use it in my review, but the spring bar adapter won't work with it. I'll keep this adapter for my thinner straps, but I need to know if anyone has seen or owns a bigger adapter for thicker leather bands?
Spring Bar:
http://www.ebay.com/itm/271877878312?_trksid=p2060353.m2749.l2649&var=570755372805&ssPageName=STRK:MEBIDX:IT
Apple Watch Bar:
http://www.ebay.com/itm/271929470540?_trksid=p2060353.m2749.l2649&var=570766663135&ssPageName=STRK:MEBIDX:IT
Here are photo's of the adapters and a photo showing the adapter won't fit my thicker band. Note: I took these photo's before I realized I had issues with the screws. You will notice the screws for the adapter on the right in the second photo below aren't all the way in. That is as far in as they will go, which leaves the bar loose.