Valve spring compressor......what's everyone use?

I see you already have something, but a couple things I built in the 1980s when I was racing a lot ....
This is small block Mopar only but could be adapted to BB Mopar. Not the best design but works well with heads on. Shaft is solid and handle is about 18" long so plenty strong for heavy valve springs. End plates are unique as each bolt hole in the end of the heads is different. Would probably cost more to build today than to buy something!hmtool1.jpg
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Next is one I threw together for heads with rocker studs. Made from a broken tool, The round part is threaded inside and screws over the stud. PITA to use, but necessity is the mother of invention; or at the the time, poverty was the mother of invention :)
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But I now have one like the type you bought, and find it to be the quickest to use with heads off. Big block or small blocks with large flat tappet or small roller springs.

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