I bought both this Pocket Pen set and the Jackknife set.
The Pocket Pen feels better in the hand, more like a precision tool, but I find the exchangeable blades to be fiddly. The inside diameter of the handle isn't large enough to just drop the extra blades in - I have to fit them back in carefully. This could be resolved by removing a few of the pick blades, but I haven't taken the time to decide which are unnecessary.
For this reason, the Jackknife is the set that I use more often. Still, the design idea is a good one, even if I find the execution a bit lacking.
The Pocket Pen feels better in the hand, more like a precision tool, but I find the exchangeable blades to be fiddly. The inside diameter of the handle isn't large enough to just drop the extra blades in - I have to fit them back in carefully. This could be resolved by removing a few of the pick blades, but I haven't taken the time to decide which are unnecessary.
For this reason, the Jackknife is the set that I use more often. Still, the design idea is a good one, even if I find the execution a bit lacking.