To clarify a few things....
The Velda was CD's first foray into HWE, but unfortunately it was not sufficiently field-tested before it's introduction, and consequently it proved to be a bit of a lemon.
It was released to US franchisees about 8-9 years ago, and made compulsory there (one Velda for three franchises held). I understand it was also compulsory in the UK, but it was and still isn't compulsory down here in OZ. Many franchisees, including me, were never going to buy the original Velda until the bugs were finally ironed out. Incidentally, the name comes from the founder's mother's name.
The Velda was replaced a few years ago by a better version, the Powerbase (A helluva better name too
)
It is made by Kleenrite, as was the Velda.
A couple of years ago, a modified RX20 was introduced. It is made by Hydramaster, as is the standard RX.
So, franchisees can utilise either HWE or bonnets, or a combo of both. Down here, the majority still prefer the bonnets, but that will change over time when they can see the better results with the RX. It is still optional here to purchase the Powerbase/RX package.
A truck mount, also made by Hydramaster is also in use in the US, and no doubt will be available in other markets soon.
So, to get back to the topic, unless you know how the rugs were cleaned, it's a bit simplistic to disparage the CD system.It comes back to the skills, motivation and training of the technician doing the work.
I hope that helps.
Jim