ok right.....In my near decade of z4m ownership I've had a good few wheel setups, including 2 sets of CSLs.
ok so these are indeed CS wheels but they are definitely genuine, they are still flow formed which means they are pretty light for their size and very strong! They have deinfitely been refurbed, you can see the paint excess on the lettering, mine were exactly the same after i had mine re-finished, a fresh set this lettering is much clearer and more uniform.
now heres the subjective bit, OP, don't be TOO dishearten by the CS front rim , as even the normal "CSL" front is a less than ideal fitment on the z4m, the offset isn't ideal (et44) the extra width of the CSL rim goes inwards towards the strut, so whether you use the CSL, or the CS wheel to get it to look good imo you need a 10mm spacer. Tyre sizing will be the same between the 2 if you wish, but personally i think you've paid over the odds for these, i sold a VERY good set of genuine CSLs in gunmetal for 1250 quid with 5mm+ on ps2 tyres, i struggled to sell them at the advertised 1400, it took a long time to sell them, far longer than i expected, maybe that was the colour???
The Rear works pretty nicely and really looks great as it fills the arch nicely without looking likes its protruding.
for a rule of thumb on the z4m on aim for 35 front offset and 25rear for a nice flush, full looking arch without the risk of rubbing, we won't get into the aggressive setups thats some of us run.