I recently bought the jackknife set from Southern Specialties / LockPickTools.com.
I have spent the last few years going through a number of different "every day carry" type pick-sets: the HPC jackknife, the HPC-KGB belt set, the SouthOrd featherweight jackknife, and now the Southern Specialties set. (In addition to the mentioned sets, I own several standard pick sets, the HPC-NDPX Dental tools, the Falle Basic Picking Kit, a pick gun, LSS/Gov't, etc. I have a fair bit of experience with lock tools.
The Southern Specialties set is far and away the best pocket pick set I've ever used. The locking is dead-solid and the tools are easy to change. Using the tool, it actually feels as if the tool and the handle are one piece. The handle is designed well enough that it's nice to use, and the whole thing is small enough to carry in my wallet after removing the belt clip. Build quality is top notch -- the housing is machined from a solid block of aluminum, and the whole thing has obviously been designed by someone with extensive machining experience.
Service from Southern Specialties was excellent. The day before the tool arrived, they called me to apologize for forgetting to include the extra pick that I had ordered. The extra pick arrived a day after the tool itself.
This is not only the only 'every day carry' set I would recommend unconditionally, but the only 'evey day carry' set I would recommend at all.
The HPC jackknife is a cheap piece of sh*t. The amount of play in the picks is abysmal and there are enough design flaws to make it intolerable. The HPC-KGB is nice and the tools are excellent, but the belt-casing is badly designed to the point that both torque tools and several picks fell out and got lost after several months of use. (this was on an airplane, in fact -- I had completely forgotten about the set on my belt, and it wasn't caught by the metal detectors.) The SouthOrd Jackknife is tolerable with some modifications, but it's still far from perfect. (the SouthOrd metal jackknife that a friend owns is much better in the play department than the featherweight one, but still doesn't compare to the Southern Specialties unit.)