I'd expect it to still make a difference - there surely isn't enough of a gap between the mirror going up and the shutter firing for any shake to settle down? I've only used it a couple of times for long exposures, the choice of an ETRSi over an ETRS here is really a case of "if you can find the later model for the same money...".
Originally Posted by revdocjim
I've paid £20 for a "spares or repair" ETR, then the same again for an ETRS body as I enjoy getting cheap and allegedly broken kit working again. The former was absolutely fine (the multi exposure lever was missing, and I don't think the seller understood that it won't fire without a film loaded unless you turn this). The ETRS had a weird problem with the lens release mechanism which wasn't too hard to sort out (I studied it for a bit, compared it to my good ETRSi, then used a small screwdriver to pop the part which had skipped out of sequence back in). Also now fine, so I have two spare bodies! Both have been film tested and seem fine, the ETR is kitted up with a plain prism and speed grip which looks brilliant with the 200mm f4.5 on! The ETRSi is more subtle with the WLF and shorter lenses.
I regularly see usable body/lens/120 back/WLF kits for £200 or less here, usually ETRS or Si. 120 backs are around £30-£40, lenses vary. I've seen the MC 150mm for £60-£70 up to £300 or so for a PE 40mm f4. I was lucky enough to find an MC 50mm for £60 a while ago.