Dear G,The PR99 is a fine machine, and $600 seems like a reasonable price. I think $750 would be too much in one respect, but you really can't go wrong with a Studer. If you buy it, I would order spare rubber parts now (pinch roller, counter belt, if applicable) and perhaps a set of brakes while the company still has them. The A77 and B77 machines were available as both quarter-track and half-track, typically 3.75 and 7.5 ips (and occasionally 1 71/48 and 3.75 ips), but 7.5 and 15 ips operations were available with the optional capstan shaft. Eddy Offord (of Yes and ELP fame) even had one tweaked for 15 and 30 ips.