The Yeti ASR comes with needle bearings to the shock linkage but the BETD kit uses sealed bearings.
Needle bearing can with-stand much higher loadings (but have no sealing) and sealed bearings are better sealed (but aren't so good with loading).
I've gone with the needle bearings as the Yeti is my 'dry weather' bike.
I know nothing about bearings but this is what BETD told me.