The configuration of the Boss RV-2 is generally speaking quite easy to follow. In terms of parameters, it has knobs for effect level, pre EQ, time, and a six point knob for choosing the mode. The reverb modes include room, two hall modes, plate, gate, and a panning delay. All of the modes are pretty cool, though I do like some more than others. I can't say I've ever had an issue with using the pedal, so I don't believe that a manual is necessary unless you're having some sort of technical difficulty.
While the sound of the Boss RV-2 Digital Reverb doesn't match the clean sound quality of its followers (the RV-5), it does sound quite good across the board. I've used the pedal a number of times for recording with a few different guitars and a '65 Fender Deluxe Reverb amplifier. My favorite modes on the pedal would have to be the plate and the panning delay, but all of the modes have a similar sound quality and this is really just a point of personal taste. While the RV-2 doesn't offer up the same type of versatility that you'd get with the RV-3 or RV-5, you can definitely get a ton of different reverb sounds from it anyway.
The Boss RV-2 is of course no longer being made, as it first came on the market more than twenty years ago. However, you can definitely still find a good amount of them on eBay, so you can get one if you want one. There is definitely a romantic aspect of having the older model of Boss' Digital Reverb, but I have to say that I like the RV-3 and RV-5 better overall. This isn't to say that the RV-2 isn't a great pedal, I just think they perfected it after this one...