At this point in our experience with the Four Wheel Truck Camper we've camped with it about 30 nights. In a nutshell, it's working out as good as we'd hoped. As with all things RV, it's all about compromises, your camping/traveling paradigm, your expectations, and you're ability to be flexible. I've written about this before.
Some folks would never, ever, choose a camper as small as this one. It's just so outside they're comfort zone. And I've got to tell you, we had concerns about it too... coming from a 40 foot diesel pusher motorhome. But in our minds, the motorhome is our "home". The truck camper is our "camper". Few people would consider a tent an acceptable "home", but many (I'm continually amazed at just how many...) use tents as their fold-up "camper". It's all your frame of reference, the paradigm you're starting from.
For us, the trade off is space for nimbleness... for the ability to go anywhere, to park anywhere. And we've certainly achieved that.
Comfort? The number one thing that needs to be comfortable is a bed. And we can report that after nearly of month of sleeping on the firm 3" foam pads in the FWC (ok, Dar added a 1-1/2" memory foam topper to her side) the quality of sleep is surprisingly good. We generally sleep through the night, wake refreshed, without aches and pains. This experience of ours makes us wonder what in the world people are looking for when they buy those 12 and 14 inch thick mattresses that are so popular today?
I'll do a more extensive review of the Four Wheel Camper (FWC) at some point in the future. This post is more about first impressions.