Not rare, but also not for sale anymore unless you are lucky to find one left over at a dealer. Check prices on WUS, a complete 95% watch that's still got it's serial number is going for around 1100 - 1200 as long as it's the automatic movement. The 2255.80 is my favorite (I own one), but the 2254 is a classic, and feels MUCH MUCH nicer than a sub. The cal 1120 in these is a workhorse that has proven itself and is one of the best movements in the business. I think mine ticks more smoothly than my friends gen GMT Master II.
MUCH nicer.
And a great deal for the quality you get for the money.