I used to have a cubot rainbow. Would never buy one again. BLU is Brazilian I think.be wary of some of the chinese clone phones out there. I've seen a few news articles that they have spyware built in.
http://www.bbc.co.uk/news/technology-27908105
If your looking for a cheap android. I'd say the galaxy s5.What is the best value phone to use for apps such as task 360 etc? I'm a bit strapped for cash right now so need to be a bit savvy.