I've got over 10,000 rounds, actually around 20,000 or so on mine. No problems. Accuracy has gone down a skosh over the years but is still way good enough, better than many stock 1911s brand new. Wilson shok buffs do fit without modification and do work. The difference is they don't have the little "keeper" that fits under the spring coils and keeps the orientation correct, but they still work. There is an outfit out there that makes the replica buffs, but they cost $15 or so for a bag of 5 which is ridiculous.
The PD will shoot virtually any .45 ACP round without a problem, much more reliably than most other 1911s, even after customization. It shoots Glasers, Blazers, shotshells from CCI, Golden Sabre, flying ashtrtays, and many of my own semiwadcutter and ball reloads, stout and tame. Yes, replace the springs with Wolff, including the mag springs, once in a blue moon. If you have the old, original style adjustable sight, don't change the firing pin spring unless you really need to and unless you really know what you are doing. Easy to mess up the sight permanently.
The PD shoots +P rounds just fine thanks, no problems. Thousands through mine. I use a heavier main spring from Wolff if planning a range session with more than a few +Ps. Wolff has a main spring kit with a nice selection. As a house gun, I keep mine loaded with Glaser Blues. I have Rem. 185 +P Rem. Golden Sabers in spare mags. Perfect. One or the other for carry depending on the situation. For self defense, you want the extra velocity of a +P to ensure reliable expansion with a short 3" barrel.
Many Officers Model holsters will work. Try before you buy.
Good luck. This is a fine gun. Shame it's an orphan now. I have checked at length but never found out who bought up or what became of Interarms' spares inventory. Alas.