I'm not a big fan of most precision drivers, as they have small diameter handles designed to allow you to spin them quickly. This is handy, but it's a total pain when you get a stubborn fastener. Many times in these instances, you literally can't afford to strip out a screw head. The reason I chose this set was because it allowed me to have a handle that was compact enough for precision work, but large enough to get a good grip on if a fastener was particularly stubborn, such as one used with loctite. Although it only has Torx, Phillips, and Slotted available, I still think it's the best solution on the market. The adjustable length really does come in handy, and allows you to sink the blade nearly all the way into the handle, creating a very compact driver. What I chose to do, was purchase this set, then purchase the Drive-Loc VI items to add on (it's the full size version of system 4 drive-loc). I added the Drive-loc VI handle, a Torx T20 and T25 blade (to expand the capacity of this kit, which goes up to T15), #1 and #1 double sided phillips/slotted, and a double sided Robertson/Square blade. I plan to add both SAE and Metric double ended hex blades in the future. For just over $100, I have a screwdriving system that covers nearly every fastener I can imagine, and still can be expanded even further by using the nut driver blades, socket driver blade, or bit holder blade. When it is all bundled up, this entire setup fits inside the space of a 12oz. soda can. VERY impressive, and VERY handy for a mobile service tech such as myself. The only (small) complaint is that the lock system is a bit on the tight side, but not excessive or to the point where it is hard to use. In fact, I would rather it be a bit tight, than too loose. It will get broken in soon enough.
