I recently bit the bullet and decided to replace some of my cherished, and often played, original vinyl. I went through a similar process, purchasing a 45 rpm Mofi, 45 rpm Uhqr, and a double disc 33 rpm anniversary reissue by a record company, just to get a sense of what was available. Prices are crazy high for most of these products considering prices for standard reissue vinyl (2 to 4 times more!).
Conclusion: The jury is still out, but I think the double disk 33 rpm anniversary reissue was excellent, dead quite and quite dynamic, most reasonable purchase of the bunch and the lowest cost of these special releases. I find that both high end 45 rpm releases from the two companies were very good, (if you don't mind getting up to flip the album more often, I personally find this an issue, lazy I guess), and considering the quality of the original recordings available. Both the one's I chose to purchase, I would consider as my favorite recordings.
I have also purchased a number of regular priced vinyl reissue's recently, and most are very good, good enough for me to conclude that I will limit my purchases of these 45 rpm special reissues.
Just as a footnote, I should add that this simple review was made using a Clearaudio Concept Turntable with Satisfy Arm, Hana ML cartridge and Icon Audio PS1 MkII Phono Preamp. Your conclusions may vary depending on your gear.