I like this product because it offer exactly what I be look for : better tone arm . pro : + it be inexpensive . this be not overly expensive and be a single unit . yes , weight be cheaper as a single unit but you 'll need more the stronger you get . + six minute workout . this come with a six minute workout that will kick you butt the first time you use it . it be not the most entertaining disc in the world , but it be effective . + both my wife and I can use it because it be up to the individual as to how hard you want to work . I can shake it harder and faster , while she be weaker so she do not use it as vigorously . + can go on trip with you . because it be a singe unit you can take it anywhere . con : - no chance to increase weight . it would be nice if the end detach to change out the weight . - only work you arm . if you be look for a total body workout this be not it . - it be somewhat noisy . I would not do this during a orchestra concert , but it be not horrible . if you spouse be `` sensitive , '' though , you might want to try something different . this be a pretty good product . I like it a lot and it be increase my arm muscle mass . it do not work miracle , but what exercise product do ?