Thought so, technical-wise.

I have one too, and have had for ages. But I fear I disagree with you. Unreliable, clunky, top heavy etc. Mine worked fine, then didn't hold a charge. Back to PH in the late 90s, who "fixed it" for free. Briefly worked fine, then seals gave out again. Handling reminds me of your non-favourite Sterling HR - top heavy with the addition of a whacking great lever dragging it down on one side.

I think Tom G in the Disunited States of America called it a "science experiment" rather than a practical air rifle. Think I agree with him. Either a bad idea, brilliantly executed, or a good idea, badly executed.