I've had a mini-SERE for several months now. It's a 24/7 IWB carry for me. I usually carry a Spyderco Caly 3 or pimped Native 1 in the LFP for work, but the mini S2K tucks away at 10:00 everywhere I go.
Added... The mini S2K and my Buck 881 are the only two liner locks that I own. I usually avoid liner/frame locks, but the locks on these knives have seen some use and are as solid as on day one.