I've used this type of enlarger and own its big brother the 770 (LPL 7700C). No problems with either.

If there's a problem with "soft" or "mushy" prints then either the enlarger is out of alignment (could just be a matter of adjusting it (search the forums and you'll find plenty of threads telling you how) or it could be bent (in which case walk away)) or the lens is dirty or duff. Either way it'll be a problem with the individual enlarger, not the make/model.

Best of luck,