For the home gym, these adjustable weight dumbbells are the way to go- Particularly if you're cramped for space or just don't want the excess clutter of a full dumbell set. Relatively simple to use and after about a month, I haven't had any issues w/them, other than having to be a little bit careful when using the weight selector insert to make sure that it slots into exactly where you mean to put it- If you aren't paying attention, it is sometimes easy to cross it up between two different weight slots but I guess I imagine that'll happen a little less once I've used them a while longer and get more familiar. A big plus for me was that the particular version that I bought (Elite USA 90) are made in the USA. I also went with the knurled grip version and I'm glad that I did. They feel more like commercial quality weights that you'd find at your local gym, which is a plus. Debated getting the expansion to go up to 70lbs. but for home gym use, 50 is likely going to be good enough for a while since I'm not going to be pushing my limits w/out anyone else around. Only deducted 1 star due to pricing, which seems a little high- Particulary for the expansion packs. Overall, thumbs up and I think these will last a good long while, based upon perceived initial quality.