I looked at a ton of them and settled on the Memphis Shades Sportshield. It comes off in 2 seconds, and the hardware that remains on the bike is very minimal. I live South of Camp Pendleton in Carlsbad, CA, and to go North I have to jump on the I-5 for 30 miles. Traffic goes along at about 80 there and without a windshield, a round trip beats the hell out of me. The sportshield works great. Only use it for those specific trips and have no problem with the little clamps that stay on the fork.
BTW, I originally bought the wrong mounts - I bought the mounts for the bigger Memphis Shades shields - my error, but if you are looking at those, send me a note and I can make a great deal on the quick release triggers for that shield.