I just bought some Fomapan 100 in 120 size from Freestyle a couple weeks ago, and I shot two rolls last week. One roll had no QC problems, the other had a little clear spot in the emulsion that showed in the sky on one frame out of the 12 on the roll. I scan my negs, so it was easy to spot out in Photoshop, but if I were wet-printing it would have ruined the image. I bought six rolls of it to try, so I can't say much more without shooting some more. I developed it in PMK and also shot some Ilford FP-4 in 120 that I developed in PMK to compare.
The Foma uses a clear base now, they've dropped the blue base from the 120 films. It is thinner than the base Ilford uses for 120 size FP-4, and much thinner than the thick base Kodak uses for the 120 size Tmax films. The Foma curled a lot, making it a pain to slide into print-file pages, and a pain to get into my scanner's neg carrier (I imagine it would be a pain to get into an enlarger's carrier too). A week or so under a pile of books cures it, but the Ilford film was flat from the beginning.
I liked the tonality of the Foma, but it is not as fast as the Ilford. In PMK, its about a 50 speed film. Grain and sharpness similar to FP-4 (but FP-4 works at EI-80 in PMK).
Here's a couple of photos from the Fomapan 100 in PMK.
These are my first test of the film in the developer, and the negs were a little thin. Editing them to adjust contrast made them look ok, but I think I'll develop slightly longer next time.
Overall, I think that if you can afford it, Ilford is probably a better choice because of the higher QC, thicker base, lack of curl, and higher real speed. Especially if you are printing in the darkroom. If you're scanning like I do, the minor QC issues I saw are easily fixable in Photoshop, but would be a pain in the darkroom. If money is an issue, then the Foma does make beautiful images.