I have 2 Dickeys and a GQF 1202. The Dickeys are what I will buy from now on. I have to cover the humidity pan to keep the humidity down (I aim for 25 - 30% until lockdown). If I remove the pan it drops too low, so I put a pane of glass over it. Some of the high speed air going by sucks out some water, obviously. They have a bucket attachment you can get to keep the water pan full. I'm sure that would solve your problem and give you much better hatches than 50% (assuming you count only fertile eggs, even a Dickey won't hatch a dud).
I recommend a separate hatcher, and that is where getting a very high humidity is crucial and difficult. I have a homemade hatcher that is a large cooler, and I can get 70% or higher very easily in there. Hatchers are easier to make than setters because you don't have to worry about turning -- the bane of my attempts at homemade incubators.
As for how easy it is to use. If you can follow basic instructions, it is easy. Do read them first, a little assembly is required. If you have any problems at all, let me know, I can call you and talk you through it over the phone.