I've had the Mishimoto kit for over a year now and feel I can adequately review it.
- the passenger headlight could not be easier to remove, giving ample access to remove the catch can. I always seem to find it a little tricky to reinstall, but the last time I set a personal best time of under 1 minute seconds somehow. Things lined up just the right way.
- I've not collected more than about 1-2 fluid ounces every 3000 miles.
- no major problems...but
- The inlet/outlet fittings were not sealing properly, maybe for quite some time. This manifested itself by the OCC being covered in a thin film of oil each time I would change it AND making my the underhood area and my garage smell like used motor oil. I removed and disassembled the OCC for the first time, cleaned it, and reinstalled all the plastic fittings with yellow (natural gas/petroleum rated) teflon tape to better seal. I can already tell a difference, no more oil smell. Time will tell if this holds. I did the same operation on the lower drain plug (which I don't use--it's always easier to just unscrew the entire lower section with the headlight removed.
-Overall I'm happy with it, it seems to be doing its job as far as I can tell.