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Didn't know that it is thinner, but then lens with mirror collisions would have chances of scratching the glass of the adapter too? I think on their site they say they are not supporting stacking adapter on top:
#7: Many manual focus lenses (e.g. OM 28/2.8, OM 50/1.8, Leica R 15/3.5) have rear protrusions (spikes, levers, other appendages) which would damage the optics and/or housing of Speed Booster™. They need to be modified before they can be safely used on Speed Booster™. Check and make sure there are no rear protrusions from the adapter/lens combination before using on Speed Booster. Scratches and damages caused by rear protrusions on Speed Booster™ are not covered by warranty.
Mr. Caldwell was commenting on mflenses so I suggested metabones to include a plastic thingy to gauge the clearance of the lens, like what Fuji included in their M adapter.
yeah, i'll have to get some measurements from the adapter. in pictures the lens looks like it is recessed enough for my needs, but we'll see.
i'd much rather have a FF mirrorless the size of the NEX-7, but we'll see if that ever happens.
My concern is the mention of the Leica-R 15/3.5 specifically. That actually clears the mirror of a Canon FF (DsII and III, anyway), so if it interferes with the adapter, there's no hope for the 16 fish, Elmarit 19 vII, Elmarit 24, or the Summilux 35. That last would be a deal killer for me if I were seriously looking at getting one.