You must get them really fit or its not worth bothering, and yes they can be moody, but when they are good they are very good, and the power in those feet omg is awesome, if you have trained a gos then you will be fine, the trick is repetition with them, rather than weight loss, thats a common mistake with reds, it does not perform so the owner drops its weight, still does not, so drop some more, it then goes into fasting mode and wont do bugger all, take it any lower and it WILL be a very dangerous customer, every time I look at the feet on mine I realise how very little escapes from a reds