Technically it's possible to combine every Apple Watch with every band Apple is selling, but wouldn't it look a little weird, if you combine an aluminium Apple Watch Sport with a Classic Buckle, Milanese Loop, or a Link Bracelet etc. with their stainless steel parts? But the thing that surprised me the most was that the most expensive version - except the Edition models - of the Apple Watch, the Space Black version, seems less combinable than the "standard stainless steel version. If you have a look at the Apple Store, you will notice that all additional bands you can buy, except the Sport Band, are at least partially made out of stainless steel: - Classic Buckle - Milanese Loop - Link Bracelet - Modern Buckle (38 mm) - Leather Loop (42 mm), I'm not sure, but I guess even the Leather Loop has a part made out of stainless steel This means if you would buy the Apple Watch Space Black with Space Black Stainless Steel Link Bracelet for $1,099 that you couldnt get the above mentioned additional bands with the same Space Black finish. I'm still not quite sure whether I should go with the Apple Watch Sport or the Apple Watch, but the compatibility with various watch bands could be the final decision criterion for me.