Product review (5 stars): Seems to be the best connector out there
I have installed several of these and found them to be the most reliable connector system.  The alternative - and this is perfectly fine too - is to have no quick connect.  However, if you are like me and want easy disconnect for cleaning around the back of the dryer and like a proper flange where the vent line passes through the wall (instead of just a hole through the wall), then this is the product for you.  It is a bit anal-retentive, which is why I think it is also perfectly fine to just pull the vent line through the wall and call it good.  But I have my line also pass through the garage wall on the other side, and I wanted to have the ability to disconnect from there as well for easy cleaning of the line; again, I also like having a flange to close-out the hole in the wall.

I also tried another disconnect product from a hardware store, and it was completely inferior.  The benefit of this system is a much tighter and reliable fit because you turn the connector to lock it down.  While no connection like this is going to be 100% leak proof, I think this particular one is the most leak-proof.  In a short time, some of the lint is going to plug any of the small gaps and you will see zero leakage.  But again, if you want complete leak-proof, the answer is as few connections as possible.

The one improvement I found in method is to use the aluminum tape rather than a hose clamp to affix the vent line to the flange and to the connector.  The hose clamps on the flange makes it harder to fit back into the wall - you will have to enlarge the existing hole a bit; my solution with the tape eliminates this.  Besides, the tape provides a much better seal.