Bruce, I have purchased a few units from him before and received everything in a timely and safe manner. His communication was also very friendly and punctual. I have no relation to the seller other than being a satisfied customer. Cheers.
In the end, it seems all can agree that the two (currently) available commercial ultrasonic RCMs achieve (if not succeed) at set-and-forget convenience. When it comes to performance, however, like all things in our hobby - one must cast a value judgement. As soon as we must do that, we are all...
My logic on using only a rinse in the tank is that over time you could change/experiment with different fluid rinses of ultra-pure water and not worry about mixing different chemicals together. I assume that if one were totally monogamous with one cleaner (that wouldn't lose effectiveness...
I actually use the very same Walker fluids as well (4-step quartet). For this reason, I've never been interested in machines that store fluid or have a connected brush (until I saw the circular brush demo). For this, I'll try the Hannl cleaning fluid made especially for the brush (non-foaming +...
I also use a Hannl -- specifically, the Micro EL. The ability to change the platter speed and reverse direction -- as well as variable suction -- are all useful features. Hannl's new(ish) Circular Brush (Rundbürste) is an ingenious piece of engineering and can be retrofitted to any Hannl machine...