There seems to have been quite a bit of interest and talk recently about the Spyderco UKPK and the other slippits, so I thought it deserved it's own thread.
I have been carrying mine now for a couple of days and here are some pics and some very early initial thoughts....
Likes; The blade being flat ground makes for a great slicer and gives a nice fine edge. I really like the CPMS30V steel and it seems to be wicked sharp.
The scales have great ergonomics and are made from nicely textured G10.
Screw construction makes for easy cleaning and adjustment of the pivot.
The opening is very smooth despite having a back spring to overcome, and I like the half stop which seems to act well as a safety measure, yet doesn't impede easy opening.
Pocket clip is both very discrete and high on the knife so a lot sits deeper in your pocket.
Choil makes the knife safer to use, reducing the chances of the blade slipping and also allows you to choke up on the blade for detailed cutting.
Dislikes;Tip up only carry (although can be changed to either side).
Quite a pricey knife in the UK.
Jimping on the back of the blade could do with being a tad more aggressive just to offer a little more purchase. Could also do with jimping around the choil to to offer a bit more grip.

More thoughts to come on this one, but first impressions are amazingly good. I'm amazed I have gone this long without one.
