I'm sure that we have had other threads on the relative merits of the stock Scamp-installed A&E Catalina 2500 awning, but I'll offer my limited experience here. Having had one on my 16' Custom Deluxe that I used a number of times, I feel qualified to comment. While the Catalina is a high-quality awning, they are not the most intuitive nor the easiest awning to put up and take down. Most awnings have arms that attach to the side of the trailer. The Catalina's awning's arms fold up and into the awning case. They're a little difficult to get in and take out, and folks under 6' tall will no doubt need a sturdy stepstool of some sort to make it work. It's helpful to have a second set of hands, but it can be put up and taken down by one person.
I certainly wouldn't pass up a used trailer with the Catalina 2500 installed, but were I ordering a new trailer today, I'd forgo the factory-installed Catalina 2500 awning and have one of the next-up-the-line A&E Horizon crank-out awnings installed aftermarket if Scamp couldn't install one at the time of build.
A&E also offers a bag awning called the Trim Line
for those of you with awning rails who don't want to spend a fortune on an awning.