Those cheap sets are fine - the needles only jump around if they're not damped. We used to use the Kawasaki sets rather than the Suzuki gauges as they were easier and the Kwacker set were dial type, almost the same as those cheap ones.
You can pay a lot more and get the Davida dial type gauges as well. They work, just no better than the cheap set - if you damp things down.
Yes they are fine once setup properly. You have to trim the dampness else the needles will bounce but that is part of standard setup. I have had. Two problems. Rubber vacume line is cheap and tends to split. I have had to cut back the ends a fee times. Also the brass extensions work well but can start to come apart. I use some solder and soldering iron to sweat the ends into the tubes to stop them fondling spart. Had mne for 4-5 years and both chef1366 and myself have used them for balancing podded carbs