Re: My opinion on this?
If this app installed malware I bet the malware would be better than the windows 10 installed otherwise.
As for spinrite, I used it once at a customers premises. 80gb hard drive, clicking away. Would eventually boot into windows given a few hours. spinrite managed to at least mark huge chunks as "bad" so that the drive wouldn't go near the clicking portions so the drive could be booted and data copied off (at the time neither ghost nor PING would clone the disk so it was last ditch). apart from that ive had little experience with it but wondered how it actually worked as I thought the drive firmware would stop you messing with raw data.