They do work fine near infinity but tend (to make an overgeneralisation) to be overcorrected for spherical aberration at long focusing distances, which means that nisen-bokeh (rings and line-doubling outside the DOF) is common at lower (0.1x) magnifications. A floating-element lens will be better in that respect.

Edit: holy thread-revival, batman! I only noticed when I went back to page 1 and saw a reply from QG - a name not seen around here in a long time.