I have a Nikon S2 kit, and at some point I read that if the shutterspeed dial was moved after cocking the shutter it would be damaged. One of the RFF's authorities on Nikon RF cameras told me it's simply not true. You can change shutterspeeds at any time, whether the shutter is cocked or not.
Nice feature: you always can tell whether the camera is ready to shoot because, if it is, the index line in the shutterspeed dial is lined up with the small indicator arrow in the body. If the shutter isn't cocked, the shutterspeed index lines do not coincide.
Quirk (perhaps?): the VF has a nice magnification (it's 1:1! Not even Leica's are this big!). However, it's NOT parallax correcteed, so if you want the image in your VF to appear in your film, just move slightly to the left. If your subject is close, the displacement will be more extensive than when your subject is further than, say, 12 feet. And at infinite, I wouldn't even bother.
Quirk? You tall me. Unlike its brethren (the Contax bodies) and some contemporaries (Barnack Leicas), loading film is not a terrible problem because the spool is nicely designed and has a slot to slide in the film leader. The catch is in that you have to dismount the entire back of the camera to do it.
Meters: get yourself a Sekonic L-86. It's a selenium meter, older than dirt, tough as nails, although of limited range. Or go more contemporary with a Sekonic L-208 (takes a battery that lasts an eternity). There's also the selenium Sekonic Leader L-38 (metal body), equally reliable, a bit tougher... within limits. They all will look great and work well with the S2.
Last: the S2 is the ideal tool for a 50mm shooter, but if you want to shoot wider, the SP or the S3 are your ticket. Just be aware that if you use the SP, you compose with one VF window and focus using another one (somebody correct me here... I'm sure I'm right, but I may not). Apparently, the S3 does have a plethora of framelines in its VF, which makes it a bit messy. Again: clean, simple and effective, the Nikon S2. Have fun! 🙂