@mel101 I have Core Home Fitness dumbbells, they are great. Just feels like using a normal dumbbell. Also pretty cheap for adjustable dumbbells. Unfortunately they only go up to 50lb so you would likely max out on some lifts within 1-2 years.
I would go with the 2nd gen Trulap dumbbells. They go up to 90lb, have a ton of adjustments and use the same mechanism as the Core Home Fitness dumbbells.
@tabularasa I also have core and I maxed out in less than a year. I’ve also had to submit two warranty claims but they’ve been awesome with their response and quick shipment.
@mel101 Just saw your edit. You can read this article about the Bowflex dumbbell review. Looks like the overall quality is okay, and the adjustable dials are fine, but there are some concerns about the durability since there's a lot of plastic in the material. Overall, it sounds okay though.