The versatool is neat but isn't very convenient for my EDC needs...especially at work where I'm wearing a suit and don't/can't have anything on my belt (At work I put my Cybertool and Infinity Ultra on my key lanyard).
I have a small tool kit for use with my bicycle and I have a bit and socket set similar to the Versatool but I actually have a mini 1/4" wratchet in there...very handy. I also have a couple of the bicycle specific tools mentioned above...some of them are very compact but still solid.
I like the SOG Power Lock idea of the 1/4" socket and I've heard that the Leatherman adapter (the one that slips over the phillips driver) also works on Gerbers with square phillips drivers...unfortunately my Diesel is one of the few Gerbers to NOT have a square Phillips driver. I've decided that Leathermans are out. I tried a couple and the 'one hand opening' blades only seem to be so for righties and not lefties. I like the SOG Power Asssist. The assist works for both lefties and righties but the mechanism means fewer tools so no 1/4" driver and I'd be back to square one.
If the 4mm bits won't stay in, that certainly would be a pain. I think there might be ways around that especially if the driver arm in the Cybertool could be magnetized. Then it could also be used for picking up screws and what not...albeit weak. I'll have to see if it can be magnetized first...with Victorinox's penchant for stainless it's possible it won't be an option.