Review and Rating: 
The PowerBlock Personal Trainer adjustable dumbbell set is a hybrid of two weight sets combining the weight stack from the PowerBlock Personal weight set with the handles from the PowerBlock Elite adjustable dumbbell set. The PowerBlock Personal Trainer adjustable dumbbells let the user adjust the dumbbells to get a weight range of from 2.5 lbs to 50 lbs per dumbbell in 2.5 lb increments, in effect doing the job of 40 individual weights. 
Review and Rating: 
The Stamina Versa-Bell II 25 pound adjustable dumbbells get mixed results in our customer reviews. While many liked the flexibility and convenience of the Stamina quick weight settings from 5 to 25 pounds (in 2.5-pound increments), others disliked the way the settings actually change. This seems to be related to whether you change by 2.5 pounds or more than that and if you need to quickly change weight settings.
Review and Rating:
The Ironmaster 75 lb Quick Lock Adjustable Dumbbell System is a 75-pound dumbbell system offering flexibility of 30 dumbbell pairs in the space of one. The Ironmaster system, which gets a 98% customer approval rating, is built around a Quick-Lock handle design letting you add or remove plates with just a partial turn of the locking screws. That means you can easily adjust the dumbbells from 5 to 75 pounds in 2.5-pound increments.
Review and Rating: 
The PowerBlock SportBlock 24 adjustable dumbbells are versatile and effective exercise tools for strength training. The square shape of these dumbbells allows them to put more weight in a smaller place. This makes these much smaller than other rounded adjustable dumbbells over the same weight range and increments. PowerBlock acts just like a weight stack at the gym, with a weight handle that fits inside the first weight, which fits inside the second, etc.
Review and Rating:
The Bowflex SelectTech 552 Dumbbells are adjustable dumbbells that have a very space efficient design and use a rather unique dial system to automatically change your resistance on each dumbbell from 5 pounds all the way up to 52.5 pounds of weight. Customers love being able to dial to adjust the Bowflex weight sets, but some customers have concerns about the overall reliability and balance of the system.
Review and Rating:
The Stamina 50-Pound Versa-Bell II Adjustable Dumbbell Pair saves space and money by doing the work of nine sets of dumbbells in one, so you don’t need to dedicate more than a few feet of space to your workout area. You can consolidate your space to a single pair of the these adjustable dumbbells which offer a series of weight settings from 10 to 50 pounds (in 5-pound increments).
Review and Rating:
The Bowflex SelectTech 1090 adjustable dumbbells have adjustable resistance from 10 pounds all the way up to 90 pounds (in 5 pound increments). Customer comments have been very positive, with personal preference applying to the slightly squared handles and overall length. Some people prefer it, some don’t. Bowflex adjustable dumbbells are better than machines or barbells for real world strength. They develop your stabilizing muscles and core better.
Review and Rating:
The PowerBlock Elite 90 dumbbell set adjusts from 5 to 90 pounds in 5-pound increments, in effect doing the job of 28 pairs of traditional dumbbells. Imagine storing 2,565 pounds of free weights while taking up the space of just one dumbbell air (each 90-pound dumbbell is only 16 inches in length). Customer reviews rave about the ability to change the PowerBlock weight quickly and easily while taking up very little floor space.
