I enjoyed Plus-X and have shot it a lot. I bought up about 100rolls a few years ago and am just now scraping the bottom of that barrel. I shoot a lot more triX and HP5 just b/c of the film speed, but the plusx has never let me down either. It is neither fish-nor-fowl for me, as well. I liked it when the conditions were right, but never took a strong shine to it. All of my medium speed stuff has been with the Birts and FP4+ for the last several years.
Tangentially relevant: Inherited a bulk loader with the better part of 15 rolls of film left on the reel. The loader was last notated on July of 85'. Shot a majority of the film at a bluegrass festival in July 16'. I developed the film in Sept and had to flatten the negs a bit, but the images were very usable, little fogged from age, with reasonable contrast and not too difficult to print. SO +1 for expired film viability for KPX (xtol +15% @ 68degF dev time)