Don´t have much info on the CMC and Prodisc (never seen in Europe), but I think they can not be more crappy than the Ritek.
Maybe it´s time for new DL-media in Europe
Maybe you forget.
Infomedia. (Very rare here in europe.Support sucks)
Philips (CMC Made but MID and specs are based from philips)
FUJI (To new to know- Probally prodisc I assume still this is very vague)
Plasmon -> which has now technology availble meaning that we probally soon have smaller european manufacturers takeing the risk.
Also Ritek's new 8x Dual Layer +R disc did get a provisional approval.
And yes there are people waiteing for ritek dual layer thanks to the low price.(Ritek costs half of verbatim don't forget that and some people like to shop cheap) I personally recommend only Dual Layer Verbatim/Mitsubishi media at this time or if you really now that your drive supports it the ricoh media.
Based on what I heard prodisc was more crappy as Ritek
CMC is a little bit better.(Philips version better as normal CMC version.)
But Philips dual layer with Philips code still is worse compared to MKM.
(Also 8x version of Ricoh is available in germanny (alternate I think has it.)
Really rateing from available media in Europe goes like this.
MKM - > Large gap
-> RICOH ->PHilips->CMC->RITEK-> large gap.
I haven't seen enough data for infomedia to make a statement.
Disc's burned looked ok but support is like with all infomedia quite bad.
For prodisc I haven't seen any good burns so far.