how many miles are you getting on those conversion kits??
i've got a Titanium road bike the i'm looking at adding one to next summer
Swizzbee is oem s-ped from 2006 so not a conversion but a nice bike when it's in full swing. A bit nosiy due to mid drive mounted brushed motor (behind seat post).
It has it's own special thread and needs a bit of TLC every now and then.
BBS is ok done about 2700 miles but on it's second controller. Currently just removed it from the Cube and in process of installing on a Kona HT with Alfine 8.
Bafang CST was in the Boardman is v.good 4500+ miles, I have serviced it fresh grease and new bearings but nothing major. It is now in the rear of the Norco my commute/errand town bike.
Boardman now has Yose hub installed with 17a 36/48v controller in my view an excellent underrated hub at 48v. Bags of poke at 48v esp in pas5, circa 1k miles on it.
I have a Bafang front BPM, 2200 miles currently not in use and also a Q128C 700 miles also not currently in use.
GSM with internal controller (BBS clone) and I didn't get on well first one failed after 250 miles and second one had issues after only 70 miles got warm and kept cutting out.
Though still hankering for a GSM without controller and coupling it with a KT 17a dual volt controller and 48v. But may a while off yet.