SK, Congrats and welcome to the club! I have the 356 on my F10 and they look very good, probably the best OEM wheels from BMW for the F10. In terms of ride harshness, I did have the set with my F10 v1.0 which did not have DHP (long story). The F10's stock suspension are a bit soft and the 20" 356 will not be much harsher, if you use non-rfts (don't hink 20" rft exists for BMW sizes anyway) on them.
But even with the 20", some may feel the gap is still a little bit unsighty. Check RC3's car where he has a drop on the suspension.
I was lucky in that when I ordered my 356 last year, the whole Hong Kong has 1 set and I didn't have to wait. Not sure about now. Didn't see many F10s with the 356 on the road, though.
I got mine done thru Wah Kee tyre shop on Gloucester Road. Dealt with them for the past 10+ years and quite good, helpful, and fast. You may want to check there. They also sources the 356 for me, obvisously cheaper than BMW MSRP.
Any tyres that you are looking to go with for the 356? I am using the P Zero Hero and they are excellent! But I may try the PSS after I am done with my P Zero, depending on how much I abuse the existing tyres
