Having owned all previous incarnations of the Rocca I thought I ought to give this v4 a go so I went ahead and bought jphelan81's
To recap my previous experience:
V1 - Nice smooth shaver, more efficient than expected.
V2 - Rough as hell, one of the worst DE razors I've used.
V3 - Replacement head sent by Muehle UK, unfortunatley no better than the v2, awful shave.
This V4 is a different kettle of fish! You can tell as soon as you inspect the head it's built to much tighter tolerances, no daylight visible at all where the blade clamps, no machining marks, perfect. It's still nicely efficient, BBS in 2 passes but sooo smooth with it.
Very happy to report Muehle have finally sorted the Rocca
PS. the R94 all stainless handle is much nicer than the black one's I used previously, maybe slightly heavier? Feels more solid, looks great and wont show soap scum build up like the others.