I love them, personally... I use a 25 ga. 1 in, but I used to use 23 ga...i like 25 ga better since it makes me shoot slower. veins are easy to spot for....go to the bathroom and stand sideways to a mirror. lift your leg up and look...you can pretty much see where all the veins are, pick a point, and make note of it with your finger....that's where I shoot.
ED