I've been using the cigar oasis xl in my 500ct and 300ct humidors for the last three years, with pretty good results. It can run on batteries, (primary source of power or back-up) has a digital hydrometer attached to it, and just needs distilled water every 3-5 weeks depending on the humidity in my house.
i've never tried the 50/50 gel (glycol?) but i've heard it might kind of leave a funky taste in the cigar. Anyone ever experience that out there?
One last thing, for those of you that have a large amount of stoagies on hand, do you keep them in there plastic wrapper (if they came with one) or not? I smoke maybe 1-5 cigars a week and I always leave them in the plastic wrapper in my humidor until I'm ready to smoke them, anyone else? There are pros and cons to both ways.
Happy smoking !