FWIW
I have two SQ dryers, the 9 electronic series with 4 temps (no heat, delicate, regular, and heavy duty).
At first I thought hmmm this dryer takes longer than my Newton Iowa Maytags did. And it took a little while to figure out what temp and dryness setting to use to get the result I wanted.
But once I got the hang of it, I get the exact result I want every time.
Both dryers perform identically.
It never ever balls sheets up, which is a huge plus for me. Also it actually properly tumbles a single item or just a handful of socks. Not many dryers can do that!
The build quality is so nice. It’s very quiet and smooth. The steel drum and fins never get blue stains with new jeans, and there’s no chipping or scratching like painted drums. It’d probably dry faster if it had a larger lint screen design like Newton IA Maytags or WP.
I dunno. For fun I put a digital roasting thermometer in it, empty on heavy duty; it topped 170 degrees but the exhaust vent never felt really hot. It’s never gotten too hot on me. Maybe there’s a difference with the knob or 8 series. ? I never use heavy duty. It seems to overdry on heavy duty and towels come out rough (like they did with my Maytag). Regular seems like the right temp for everything and you get the dryness result stated on the buttons. Low is very low. I can’t envision it ever actually drying a load on the low heat setting. That’s not a problem for me. I like to use it for clothes like polo shirts and khaki pants which I just dry on low for 15 minutes to dewrinkle and then I hang them to dry.
It does a perfect job of drying loads of underwear and socks on regular temp,near dry. The laundry is dry enough to fold but not over dried, even socks although they’re thicker. I dunno. It seems to be very easy on clothes. I don’t have socks and elastic pooping out from being over dried on heat too high.
If I did dry clothes all the way I’d use regular temp and less dry so the seams would be slightly damp and it’d stop before shrinkage.
It suits me just fine. Other people (with different laundry practices or needs?) have voiced frustration, so I dunno.
My vents are relatively short and direct with rigid metal and the shutter type vent covers outside, FWIW.