to echo Jazdoc's comments; i too have the Miyajima Premium Be Mono. it's mounted on my Reed 2P arm on my Garrard 301. it did take some time to break in; and demanded a good setup to sound optimal.
most of my mono Lps sound better on this $1100 retail cartridge than on my Rockport/Lyra Olympos stereo cartridge ($11,000 retail).
this morning i was playing some of my 45rpm Jazz reissues and played a mono on the Rockport/Olympos. for grins i tried it on the Garrard/Miyajima Mono and damn! it sounded a significant degree better.
caution; the Miyajima is one of those 'different' mono cartridges that will harm a stereo Lp.
there are a number of other things to think about with a mono cartridge beyond what Elizabeth mentioned above.
some of them might want a heavier arm than medium compliance arms most of us have. for instance; the Miyajima works on the Triplaner or Reed; but it might work better on a heavier arm.
some mono cartridges have just one magnet, but with the normal 4 output pins. which means you will have a ground loop if you connect like a stereo cartridge is connected. i had to use a splitter into my stereo phono stage and leave one channel disconencted. then i use my 'mono' switch on my preamp. if you don't have a mono switch then you would need to find another solution.
the Lyra Titan i mono has 2 separate mono magnets; which avoids the whole 'ground loop' issue and allows a normal connection. other mono cartridges use normal stereo magnets and simply 'sum' them so a mono signal is sent to the preamp.
as Elizabeth mentioned some use the smaller stereo stylus and others the larger mono stylus.
anyway; even if it sounds complicated it's not; you simply have to understand how the particular mono cartridge you choose will integrate with your system.....and what adjustments might be required.
