Half-Speed Masters - are they worth double dipping?

Wow, my coffee hadn't kicked in when I wrote this:

... the LP version of an album often has a much wider dynamic range. And of course the HF on an LP can extend way beyond that of CD. Those are two reasons some people still by CDs.

What I meant was that's why some people still buy LPs.

Half speed mastering is somewhat controversial. While it can provide some benefit in higher frequencies, some mastering engineers and audiophile producers find it does so at the cost of lower frequencies. The "best" engineers (Bernie Grundman for one) now opt for regular speed mastering.

I am not impressed at all with 1/2 speed mastering. Like 180 gm records some of it is still garbage pressing. I really enjoy 45 RPM records, they are definitely better as long as you do not mind getting up every two or three songs to flip sides. I have the recently released Joe Walsh the Smoker You Are Analog Productions 45 and it is killer. I have not had a bad 45 rpm pressing yet. 

I have some half-speed mastered vinyl from the 70’s. It was truly amazing. But, that was then… don’t think I have any recent.

Ditto @ghdprentice. Mostly Japanese from the 70s. Pressing was good and they still sound wow to me on the rare occasions when played.