As you say, simple to work on and parts are very cheap and available, I get all mine from Big Dans Airguns as he is a Kral dealer with great back up

My pro500 had three calibre kits and Id swap around, simple to tune for better sub12 performance and big shotcounts, Ive sold all my other pcps and have just a Kral a Benjamin(kral) and a Kuzey(kral) as there just great for my useage and I can service them myself.
Yes Ive had dozens of pcps costing much more, their all gone now but these remain, oh and now a growing collection of springers