Just Thursday I did a 180 Cub with the DSS balancer. Will report back as soon as I get some other stuff done and test fly the thing. A buddy has the Helmuth unit, and I can get his opinion for you.
I have a MicroVibe unit and just bought a DSS unit because of the helicopters I maintain and need the tracking ability that the Dynavibe does not have. The Dynavibe is a great, simple to use device and it works very well! I have balanced 30-40 aircraft with it and my customers are VERY happy with the results. The 180 and 185's with long props are the most out of balance, so far. Even when they are overhauled and statically balanced, the dynamic balance sucks! I can normally balance them to below 0.05 IPS.