a yamaha pre/power combo from ebay. a c4pre and m4 power. has anyone ever owned one of these? was it any good? ive had a few bits of yamaha studio equipment over the years and have been impressed with its hifi qualities but never any of the hifi specific products. after sending a question to the seller he replied that the power amp alone weighed in at 25kg so impulsive me thought that this fact alone justified the £75 asking price. what are your thoughts?