I owned it and loved it but using Zeiss lenses on the M8 is a PITA. You probably will have to get Zeiss to send you a new mount in order to bring up the proper frame lines and then have John Milich (or another machinist if you like) mill the indents for six bit coding (and with the 25 you need to have it coded.)
On the other hand it works superbly on the M film bodies (I used it with both the M3 and M7). Plus it's price, compared to the Leica 24 Elmarit, is within reach of us mere mortals. Of course the new Leica 24 super elmar is more worldly priced but still almost $2500 so again the Zeiss is far more accessible.