Just got back from 50 days on the road to Alaska & back. Have owned Aliner aframes for 7 years.
1st one, 10' box, was too small. Either had to eat or sleep. Lasted 2 years.
2nd (current), 12' box, has permanent bed set up & permanent dinette. Good for longer trips.
Quick to set up, but does require the ability to do a limited amount of bending & stretching--one has to reach overhead to push up the roof to set up, and the ability to push a little to drop it. Really a clever approach. Us two healthy 60ish campers can set up to dive in (in a heavy downpour for example) in 5 minutes.
9 moving parts between sidewalls, roof, etc. so while the design is simple, like any RV, there are maintenance issues. Unlike most RVs, you can reach all the parts.
We love the open feeling--lots of windows. Storage is limited, but hey, we just did the Alcan (with 3 other Aliners) without difficulties. Towing with a 6 cylinder RAV4.
Serious pros: lightweight (our 12' box weighs about 2,000 lbs dry) and aerodynamic, easy to use & maintain (relatively speaking on the last)
Serious cons: You gotta shop for a decent unit. They aren't all made the same. Some standard parts, but it's highly favorable if someone in the family likes to tinker.
Modest pro: You can do A LOT of customization with limited effort.
And dang, they are cute.