I use the older (cheaper) hand held (I assume single beam) Bedini before evey play. Modest improvement overall - slightly cleaner presentation. Before modding the front end I thought it's effect was more substantial...now, fairly incremental only.
I read somewhere that the (more expensive) dual beam unit was brought out becasue of the higher density of DVD discs...that the single beam unit is sufficent for CD's...if that's all you'd use it for.
Who knows......
