Product review (5 stars): Great - Compared to Cigar Oasis (Read)
I can do a direct comparison with the Cigar Oasis and Hydra LG since I just bought both recently. I initially bought the Cigar Oasis plus and then this.

The Cigar Oasis: No way to run extra fans on the new models as the ribbon cable and power ports have changed and no longer compatible with Hydra fan kits. No audible alarm. Otherwise works well and constructed well (both at China made so not super quality but both comparable)

Hydra-LG: I wanted the Hydra small but it was not available from Amazon directly and I like buying directly from amazon so I bought the large. Glad I did. Its pretty big so I have to take out a bottom shelf. You need minimum 5" height. I bought the Hydra as I wanted to run two extra fans to circulate the air, humidity rises and I had quite a difference from top to bottom. I love the fact that you have a choice to run the fans continuously or only when the Hydra Humi fans come on. I opted for the second option for now. I love the remote with display also the fact that there is a on/off button which Cigar Oasis does not. Its very sensitive and comes on quickly and silently. I did have to calibrate it a little it was showing 3% higher humidity and it was easy to calibrate. I just put it next to my Extect Calibrated Pshycrometer and adjusted after a while.
I placed the two extra fans on the second top shelf in the back at an 45deg angle one pushing air down and other up for now. They are working well. I will adjust things as needed. So my vote is for the Hydra and don't waste your money on Cigar Oasis for a large Humidor, lets hope it lasts.

Lastly the cigar oasis build quality seems slightly better than Hydra and the sensor is easily recognized on the CO, on the Hydra no idea where the sensor is. I called support and they didn't know either. At least Hydra has a support number to call CO has no support number to call.