I just got done cleaning mine after a range session. To answer your questions in order: Yes, (conditional) Yes, NO, NO.
The stock weapon is easy to shoot with minimal recoil...certainly not like any magnum type kicker, more of a push that causes some muzzle rise and a bit back at ya. KT offers the muzzle brake shown and I shot it for the first time today. YES!! Berry, BERRY nice! It actually depresses the muzzle on firing! At first, this seems bad but you quickly notice that the sights are still where you touched off the round and ready for another in the same place. I was able to double and tripple tap a 6" rock at close to 50yds. Well done KT!
I broke the 500 round mark this afternoon and tonights cleaning was its' first. Wanted to see how it worked when dirty and it works well. Only ammo it seems to not like is Wolf (big surprise, eh?) but it WILL eat 100+ before starting to have ejection problems. If you keep shooting, the problem escalates into failure to extract so I stop shooting Wolf when the ejection troubles start.
Running a mag of brass cased ammo through the gun takes the crud out of the chamber enough for Wolf to work again.....for 100 rounds. And so it goes.......
If you are thinking about getting a PLR, I'd advise getting the 'loaded' version with handguard and brake. On some weapons they are just there for eye candy to pimp it out. The PLR really, really needs the forend if you plan on shooting it like most people do. It only takes 10-15 rounds before the barrel is too hot to touch and the forend gives you a great place to hold for better control than the magwell offers.
The single-point sling is a keeper too. Allows carrying without hands and, when pulled tight in a shooting position, offers a lot of stability to the platform.
Red dot sight is not really needed, but I shoot a LOT better with it than the irons. You cover amost all of the intended target with the irons whilst the red dot allows full vision of the target and surrounding area.
Mine is a 43mm Simmons and, knock on wood, so far has held up just fine to the concussive HELL it goes through when this thing fires.
I left the best part for last...the sound. Rather, the FEEL of shooting these things. With the brake installed, it kind of reminds me of the AR-50 BMG rifle concussion. Not quite so bad, but more than ANY other pistol or rifle I have shot. It pounds you and will make my ears hurt after just a couple of rounds with only 29db earplugs in. Muffs over the plugs for sure for me!
KT builds a quality product and has Customer Service second to none so don't worry about that aspect of the pistol. Everyone I have let shoot mine has lusted after one. They are a VERY entertaining weapon to play with. Don't think I would go straight to it for defensive purposes because of the nasty muzzle blast issue but it would make a dandy Zombie killer out to 200+ yards.