Hi Alan, they're a very futuristic looking motor and love the rough stuff.
The same chassis as the Vortex with conventional engine cover is easy to keep free of debris and is a joy to use and can be had fairly cheaply.
One mower repairer on YouTube actually moved a PT over from a good alloy base with the thumb latch catcher to a steel base because the thumb latch catcher was too fiddly to use. Yes they are a little more difficult than the simple flap over design, but well worth it for the superior performance and feel of the other base. He is crazy in my eyes.