What makes or breaks a Pellix is the pellicle mirror. These are optical plastic (or something) and pretty much can't be cleaned without scratching the bejeezers out of it. And once the mirror is scratched, it's pretty much toast. They are interesting cameras though and definitely harken back to a different era. I've got a couple that I still use when the mood strikes.
thought I'd post an update on what I'm up to with the Pellix. I'm just running a trial roll through and have no photo results, so this update is mostly from reading the manual and posts in other places.
Thanks to the advice I found here and in other places I have found a battery for the Pellix from www.vintagebatteries.com. The Wein cell seems to be the ideal replacement. Some people suggest using other zinc-air hearing-aid batteries and jamming them into place with O-rings. Of course, using silver-oxide batteries and compensating the exposure would work. I found getting the meter recalibrated would be the most expensive thing to do and so I didn't take that route.
the mirror is certainly near impossible to clean as titrisol says. I am even nervous about using a compressed air blower on it.
As for exposure errors, the manual also recommends 1/2 stop overexposure with flash as Kark K said. with daylight it should be OK. the manual recommends using a lens hood when shooting bright objects and with flash.
I guess all said and done the Pellix might be an interesting curiosity to play with once in a while. I don't imagine it can be used for any critical shooting. I would certainly use it for casual/street photography except it's a monster to lug around