I have one and an Andair one, too. I decided to use the Andair one in my RV-3B. Here's why.
The Aerolab one, at least mine, has a little button that must be pressed to open it up. The button is unreasonably hard to press - the force needed is very high - as well as being tiny, so the pressure is high. Very high. And it has to be continuously pressed to unscrew the filter, while the threads used are annoyingly fine-pitched, so there is a lot of turning. I decided that the pressure, which was painful enough in the shop, wasn't going to be reasonable for year-to-year use.
That was the main reason. Basically, the ergonomics were too annoying. Not just bad - annoyingly bad.
I contacted the manufacturer and they outlined their thoughts as to why this was necessary. Too bad.... I used the word "painful," and that's what it is. There's no way I'll install something like that.
While the gascolator is intended to fit behind the firewall, it cannot be rigged to drain it remotely. With the Andair situated similarly, I can arrange to have a remote drain device. The RV-3B is a small, low airplane and crawling under the belly every flight won't be easier as I age.
Given that the Andair needs a mounting design and the Aerolab attaches to the bottom skin, there's little net weight savings to the Andair. But on my plane, I'll be including a Fiberfrax layer and an external protective Titanium firewall, and that combination adds to the mounting complexity of the Aerolab. Still entirely doable, though, so if you are going to use that system, don't let that dissuade you.
Just check the ergonomics first.
Dave