I just installed the OEM's last night (well mostly last night -- read a little further). I had my reservations about them, mostly the seemingly much smaller case on the exhaust side. Well, now that I've been handling them and have had a good look inside, it turns out to be somewhat of an optical illusion caused by the exterior black trim on the edge of the case-- when you look down inside the exhaust side bag, it has virtually the same dimensions as the right side case, with only a very small little ledge on the bottom of the interior for the exhaust cut-out, seriously!
On a side note for any of you who'll be installing the OEM cases yourself, you will need a Torx
security bit for the two large mount kit bolts. I don't know the size off-hand, but it's a fairly large one -- I'll try to check size tonight if I get the time -- and you'll also need a size 10 Torx
security bit for installing the lock cylinders. I would've been able to completely install the mount kit last night, but didn't have the large Torx security bit. Then, when I didn't have the small size 10 bit for the locks, I had to take another trip to the store to get those. Probably best to have them on hand before you dive in. Seems kind of cruel that Yamamamma wouldn't include them, but if they do, they didn't with mine...
You will also need some kind of bonding agent (they recommend Yamabond) to affix the rubber pads onto the mounts that are attached to the footpeg support assemblies. I didn't have anything else on-hand, so I used JB Weld. They don't mention rubber in their directions, but the JB weld website does say it will bond together any porous (such as rubber) and non-porous material (such as steel). Hope that'll do the trick (I'm kind of worried someone is gonna chime in and say "Ohmigod, you just melted your new motorcycle by using JB Weld on the luggage mount rubber!") but mostly just mentioning this so that you have some bonding agent on hand when you install your own sidecases.
EDIT: Thought I would add that I haven't found the locks to be too 'fiddly.' I can see where a heavy-handed, caveman type would have trouble with them, but a little touch and finesse goes a long way with the locks. Sorry if I've offended any cavemen out there >
. I would also add that installing the lock cylinder helps a great deal in understanding how they work, but, again this is only my experience, YMMV.