To change the subject a bit - do 45 rpm albums sound that much better than 33? Are they worth the cost?
short answer yes.
long answer......
if you are comparing a 45 and 33 reissue, the 45 is 99% reliably better.
if you are comparing a 45 and a random earlier copy again the 45 is reliably better almost always.
if you are comparing a 45 to an original pressing or very early pressing (of a 50's or 60's (or even 70's) recording) then it's a crap shoot and trade-offs are many times involved. however; in these cases the 45 is likely cheaper (and often much, much cheaper as the best original 'mono' pressings can go for over $1000 up to $3k to $5k) and more reliable as to playability. and the 'chase' to find the right 'original pressing' takes much time and has a steep learning curve. it's easy to buy the 45's and just enjoy them.
in the case of Music Matters the 45's are consistently excellent sounding in any case. I've got them all, but have not purchased any of the MM 33's.
if you like golden era jazz music then the MM 45's are a no-brainer good value (as are the AP's too if not quite as consistently fine sounding). if you have not developed a taste for the music buy a few and try them. it's the best you will likely ever hear this great music and as time goes by the price will only increase for these.
the only good reason not to buy these is if you have a phobia against having to turn the 45 over sooner than a 33, and I know some feel that way. YMMV.