I've gotten flawless performance from the Colt 7 round 45 ACP mags in my Colt and Kimber full size pistols and the Colt and Ruger commander size pistols that I've had... and the Colt 6 rounders ran in the Kimber and Rock Island officer size pistols that I had even when the factory mags wouldn't. I've got some no name government number type 7 rd mags that I use for the range that run even with my SWC ammo... and I've got a couple of CMC 8 rd power mags in which I've changed the followers that have done well also... I would use them as a back up to my back up mags... but, so far, I've only used them on the range, and not very often simply due to always running the 7 rounders... I guess I just got them so I could say I had some 8 rd mags...
Some maker has a slightly longer mag body with a bumper pad covering the extended body on their 8 rd mags... I can't remember which one at the moment... but, that would be what I would want for adequate spring / follower travel and stability in an 8 rd mag that would be used for business purposes, all else being appropriate...
I've got a 7 rd Wilson Combat that has ran well too, that I would use as a back up... But, the mags I use when they positively have to run right are the Colt 7 rounders with the prancing pony.
As always, "Your Mileage May Vary"...