The only drawback to the 124 compared to the 124G is the silly checkerboard vinyl they used! Other than that, it is the same lewns, same shutter. Only a better wind mechanism, less plastic all around. The 124 G is a sheeple camera; the 124 is a classic :) Don't be a sheeple, go for the better camera!
Remove the vinyl and get some griptac covering and you'll be in heaven.
Compared to ebay, when buying in a place like this people are more exposed, have more investment in their reputation, and hence much more willing to make certain that a buyer is satisfied.
John Koehrer is right that leaf shutters will be slower than stated at highest speed. A full stop is the far side of out of spec for 1/500, but after that you should expect better. Compur's stated tolerance for 1/250 and 1/500 is 20%. The OP said that higher speeds- plural- were a full stop off.