I have also persevered with Crank Brothers pedals due to:
- Low weight
- Cheap custom Ti spindle length options
However these CB pedals have downsides causing me to switch:
- The bars are pretty likely to destroy your shoes- I am getting through the aluminium shoes savers pretty quickly!
- They are a disposable part in my opinion
- Even using the rebuilt kits can not get around the quick loss of spring tension causing almost unrestricted float
- Fast wear to the axles causes play at the axle.
- Cleats wear exceptionally fast. Mine would last only a few rides before almost unrestricted float started appearing. Not good when combined with the sloppy springs.
- The two points above contribute to the biggest negative I can see- very, very little support of the foot. This is not just due to the small size but the general sloppy interface between cleat and the bars of the pedals. If you clip a shoe in to the pedal and manipulate it in all directions you can see there is very little restraint in any direction. This may or may not irritate any knee issue you may have as was the case for me.
I now use Shimano XTR and I think most people eventually concede and take the extra weight of an SPD based pedal based on overcoming all of the issues noted above. I held off for a very long time due to stubbornness but am glad I made the switch! My knees thank me
P.S. Speedplay are the work of the devil if you search this forum and others
All jokes aside, there are two schools of thought with pedal float and everyone is different but my belief is that the bike should be fit correctly (with a pedal with a small amount of float) and there should never be any need for the large amount of float with designs like Speedplay. If anything the extra float may upset a lot of people joints rather than help them- the pros tend to make some mods to restrict the float if I am not mistaken???