If your R-D 1 is in good nick, you'll definitely have a great time (and a lot of chances to shoot great pictures.)
In addition to checking the RF, I have two pieces of advice:
1) Check the firmware version right away to see if it's had the upgrade. One easy way to tell is to see whether or not there's a "Dead Pixel Correction" option on screen 2 of the Basic Setup menu; if yes, it has had the upgrade.
If yours hasn't been upgraded: the upgrade does increase power consumption somewhat, so you might want to pass if long battery life is your be-all, end-all concern. Other than that, though, the firmware upgrade is just about a must-have. It makes the camera easier to use (persistent histograms, 16x max magnification for raw files) and improves image quality (dead pixel correction.)
2) Once you've tried out the camera, try it with every lens you can get your hands on! Invest in at least one screw-to-bayonet adapter so you can experiment with the kazillions of screwmount lenses made since the '20s. Part of the fun of using an R-D 1 is that you can stick such a huge array of RF lenses on it, and get immediate feedback via the LCD on what kinds of pictures they make.
If you like RFs and are interested in digital photography, you are almost 100% sure to enjoy the heck out of this camera. Good luck and have fun!