Yes, the enrichment jet is very effective at richening the mix, will definitely help if you have a tough time with a cold start. If you don't have any cold start issues, however, I wouldn't bother hooking it up.
I connected my enrichment jet to the shift lever for the front dérailleur (cause I never used it to shift gears after the motor went on the bike). I really like that setup because it allows me to use my thumb to hold in the lever and richen the mix when needed, and when I let go it snaps back to closed (if I don't push it far enough to latch) When warm the bike doesn't like to idle with the enrichment jet open, which also works good with my setup, cause I can kill the motor (at idle) by pushing enrichment lever. I was able to eliminate the kill switch since this method works really well, I just kill the motor with the choke now.