Really? Don't get me wrong. Magoosh is good, but it strikes me as kind of generic compared to Empower. You should try both. For me though, the instructor style at Empower is night and day better, so I'm a big fan. Yeah Empower is $99 per month and Magoosh is $99 flat, but they're both way less than other courses I would have taken anyway.
I also mentioned this in another thread too...most importantly, my scores are up across the board, and to me most surprisingly on the vocab questions. The Empower tactics show you that it's really not about the vocab, but instead it's all about the context. It's really strong.
Poiple mentioned the 24 hour trial above. That's what I had too, but on the homepage they're running a 5 day for $5 promo code right now.
I hope that helps! Back to studying.