i just installed the clip draw on my g22 last night. The install went without a hitch, you just need some type of punch or small metal rod to hold in the spring to get the back plate off. I tucked it in the back of my waistband and it felt ok........the g22 is a little big but it felt secure enough for walking around carry. The others bring up some good points about carring this way and safety, i might have to consider putting one of those safetys on my glock if i was going to carry like this all the time. I will probably go with an iwb holster as well, and just keep the clip draw on there for times i dont need/want it holstered.
I have one on my keltec p32 and really like it on that gun, but its way smaller too.