So my information from DA is a few years old, but I worked for them for a long time and overall enjoyed my experience. Within ADA I had the opportunity to fly low/high level aerial survey all over the world.
As an FO, you can probably expect to make around 30-40k over the course of a year. It may be more or it may be less depending on how busy your year is. When not out on a project, you're expected to be working in the shop and without an A&P your hourly pay is pretty low.
I averaged about 400 hours per year when flying ADA. ADA is a great opportunity to get hands on aircraft flying and really learn how to precisely fly the aircraft. You don't get much or sometimes any IFR experience so you'll get rusty.
Schedule is all over the place as you may have 12/24 or sometimes several weeks notice about an upcoming survey project. That said, Dynamic is a good company and the ADA managers etc will work with you as best as they can to make life livable.
I'm sure you've got more questions than I covered, so if you have any more just ask.