Whether "half-speed" or "45 rpm", the answer is the same. "It depends." I have some "45s" that sound like you are in the recording studio with the musicians. I have others that are inferior to or at least no better than their "33" counterpart. Ditto "half-speed." I will say the best "45's" are superior to the best "half-speeds", at least in my experience. But you have to listen to each in order to know what is worth buying. Much of this is gimmickry and marketing, as you find with the current trend of "180-gram" vinyl. A crappy recording cheaply stamped on a thicker piece of plastic just a thicker piece of crap. Until you listen, you don't know if you are getting the wonderful quality of vinyl or a cheap copy of somebody's CD.
Half-Speed Masters - are they worth double dipping?
I have pretty much read all that being said online, what is your personal experiences with half-speed mastered records. I see a growing trend in lot of re-issues now being sold with half-speed mastering.
The two records I am interested in are,
Ed Sheeran’s X -10 Anniversary and Police - 30th Anniversary Greatest Hits.
One good thing is, they are reasonably priced and under $50 :-)