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I use the RRS MH-01 tilt head for heavy lenses, and I have a little Manftotto 3232 tilt head on a light weight monopod for travel. It works great.
I agree that Hejnar makes great stuff. He's eBay member krosno65 and he does make a monopod head,
The RRS MH-01 head has two curved guide/clamp tracks, one on either side of the head support, while the Hejnar has one. I think the RRS symmetrical design is better, but that's not to say that there's anything wrong with the Hejnar product. I have a lot of his clamps, rails, and a 'long lens support', and they're all top quality.
The Sirui L-10 looks like a clone of the RRS MH-01. I'm glad to hear that you like it, sounds like a real bargain.