I have been using them since May, daily payments, not had any problems.
Keep a track of my you tube videos which I am doing, that will give you an idea about daily payments etc
What is their ROI? 5 months?
I paid 0.0562 for my 1 MH/s Scrypt and 10 GH/s sha 256 contracts.
So far 6 days in I have 0.00342310 and perhaps tomorrow up to 0.004.
It might be between 4 and 5 months at the moment.
I know that right now I will definitely reach ROI before my GAW miners contracts as the payments on the Genesis Hashlet and the Waffle Hashlet have just been poor in comparison.
I think you should try to compare with Zen hashlet. ATM, that is the most profitable one. Also take into consideration it is much more expensive then Genesis Mining. IMO, both services are nice and I use them both. Differentiation is the key, spread your risk.
For me I have found the Genesis Mining 1 MH/s contract to be more profitable over the first week of comparisons, not by much, but 5 days out of 7, my payouts were better than the Zen Hashlet, will be interesting to see how it goes next week. The payments were very similar, not a lot in them, but the Zen Hashlet also cost 3 USD more so it has 3 USD to make up as well.
Ian