I've got some Vector 2s and I've been very happy with them. They're a bit fiddly to install but once fitted they just seem to work. Don't know about the 3s though.
There seem to be good ones and bad ones. I know people who’ve had no issues and others who’ve sent them for replacement and (eventually) ended up with a reliable set.
What's the consensus on vector pedals? I've been given a 40% off voucher by Garmin to make up for crappy service.