I actually own these. I bought them 2 years ago when I had serious tendonitis in spots and thought I would never be able to lift heavy again. Also for my wife.
It really depends on your size, goals ect... For a small person who is a beginner, yes. For a woman, yes. For a teenager yes. For someone who uses AAS, NO WAY. There are a shit ton of selectable weights up to 52.5 lb. If thats really heavy for you then yes they will be great. I personally warm up with 50lb DB's so they are of no use to me.
As far as consrtuction, functionality, ease of use, they are second to none. It really pains me to say that about a company that makes IMHO, garbage home gyms "BOWFLEX". But the DB's really are great. The selector is tight and clicks into place and stays there. The DB's slide in and out of the holders effortlessly. I tried every set of selectables they had and they were all garbage in comparison. Bowflex DB's were at least $100 more than all the others. But The others really were just SHIT.
Not to pimp bowflex stuff cause all the shit is overpriced.