I have 1/4" and 1/2" impact sets, and use them on my 1/2" impacts and 1/4" impacts. The chrome stuff doesn't go on power tools, but I know lots of people have no issues.
I've always been of the impression that my 1/4" chrome sockets were bigger and heavier, but I just went a little nuts in the garage and proved myself wrong.
My 14mm Tekton 1/4" measured out to 19.5mm and 33 grams
My 14mm Sunex 1/4" impact measured out to 19.7mm and 23 grams
Hmmmm... I got my 14mm 3/8" and 1/2" Chrome and 1/2" Impact sockets out...
1/4"-------------1/4" Impact----------3/8"----------1/2"----------------1/2" Impact
19.5mm/33g---19.7mm/23g ------19.6mm/36g----22mm/55g----23.6mm/77g
Since I had them, I did the 10mm as well
1/4"--------------1/4" Impact----------3/8"----------1/2"----------1/2" Impact
14.2mm/18g---14.2mm/14g-------16.7mm/25g---22mm/48g---21.7/66g
My conclusion? I don't know what the heck I'm talking about. So they're less likely to shatter, and I guess the reduced vibration might more-efficiently transfer the power from an impact, but it looks like the mass thing is mainly true of 1/2" (and I'd guess 3/8" as well). Maybe since the kind of high-torque applications live there?
I dunno...