Product review (3 stars): Only Usable With Flex Dryer Vent Hose in My Opinion
I used semi-rigid dryer vent hose instead of the more flexible aluminum foil/vinyl type ducting. The reason is the semi-rigid type is all metal and more fire-safe. The snap to vent 90 is a nice concept. But it has some problems - It does not work well with the all metal semi-rigid ducting. First it's very hard to get the semi-rigid inserted into the snap-in collar, and then very hard to get the snap-in collar with the ducting attached to snap into the 90 degree "L". Secondly being semi-rigid when you slide the dryer back it tends to want to make the 90 degree "L" come lose from the dryer. And finally, the 90 degree "L" is really relying on being shoved against the wall (baseboard in my case) to hold it onto the dryer. That will result in marks on the baseboard or wall I think.

The fit between the dryer and the "L" is "iffy" in my opinion. And the vinyl friction sleeve that holds the dryer outlet connection seemed to not be quite a perfect fit to the inside of the "L" so when inserting the "L" onto the dryer most times the vinyl friction sleeve would get misaligned and not hold.

The good:
Nice concept, a push on "L" dryer vent end.

The bad:
Do not use this with all metal semi-rigid ducting. It creates as many problems as it solves in this case because of the stiff semi-rigid ducting. I would have returned it unused if I had known then what I learned in the installation. If you are going to use semi-rigid all metal ducting for fire safety reasons, get a metal 90 degree L instead. It won't be any more difficult in the end and more fire-safe on my opinion.