I have been studying with Gold Seal too and really like it. It has a lot of interaction built in and the randomized tests are awesome. I may have more to say after I pass the FAA test!!
Might be unlikely but after seeing this video it doesn't look like something I want to experience
https://fpdl.vimeocdn.com/vimeo-prod-skyfire-std-us/01/444/7/177222403/576987979.mp4?token=1494200656-0xd0c1482b78489adac112a8bf7b92ccd3ada474a5