You’re right DBCstm, that’s certainly one major difference! I encourage everyone to build their own. :-p
The only drivers I currently offer to build are the drivers in my Lux-Pro kit.
To underscore that point: These 3 pictures show my A17PZL driver (which uses full size 0805 footprints) on the right and a different driver which employs 0603 footprints on the left. As you can see I’ve got a pair of 0805 sized components for each driver and I proceed to lay them onto the pads. 0603 pads are usable for 0805 (and there is a specification for using that sized pads for 0805, it’s not just some hack). The difference is that hand soldering, inspection, and rework are all more difficult with the smaller pads. Click for big versions.