Is anyone an ALT in Japan?

[tikibirds]

I currently work in China at a English conversational school and my contract ends in August. 
I was recently hired by Heart English to be an ALT in the Kanto region (Tokyo Area) starting in September. My contract with Aston is quite nice as its 4 days a week, free housing and no more than 20 hrs a week - mostly on the weekends. However the contracts for Japan seem to be not as..cushy..as the ones in China. I have to pay for and find my own housing in the Tokyo area, pay for transportation and work more hours. Obviously the pay for Japan is higher than china (my salary is about 1200 USD a month) but the cost of living is so low and its easy to save money.

I'm curious what people who have been ALT's thought about it.