A few things to consider. The M5 is the best built leica camera, period, they simply went all out and consequently it was extremely expensive to manufacture, this is the reason leica almost went under when the m5 wasn't a succes.
It's also the most quiet Leica. (I have tested it against all the others, MP included, and it's definately quieter.)
The shutter speed selecter is more cleverly placed than on "normal" Leicas. The finder is identical to the M4 except the lightmeter. So the finder is better than any leica that came after up untill the MP.
The only thing it has going against it is it looks, simply because it's different than all the other leicas.
I love it, I think it's the coolest leica there is. Go figure...