I'm not liking dryer flex pipe at the moment. The semi-rigid aluminum stuff has been a real bear to work with. Getting it to stay on rigid pipe or elbows has been a challenge, and I end up wrestling with it to get it to seal well. The next time I need to mess with dryer ducting, it'll be replacing the semi-rigid duct with rigid pipe. For my particular application, it's simply the wrong material. The dryer sits right below the outside vent pipe, so it's a simple matter to run a piece of straight pipe with two 90* elbows at each end.
OTOH, there are some situations where it's invaluable, such as in my old apartment. Rigid pipe would have been a very hard/expensive solution, and a piece of flex pipe was exactly what was needed to vent the dryer to a vent placed in an odd spot.
OTOH, there are some situations where it's invaluable, such as in my old apartment. Rigid pipe would have been a very hard/expensive solution, and a piece of flex pipe was exactly what was needed to vent the dryer to a vent placed in an odd spot.