I have had an H001 in .22lr for 11 years and I like it for plinking. I looked at one in .22mag but when I found out I could handload .357mag ammo cheaper than I could buy even the cheapest bulk .22mag, I passed. I like the idea of the .22mag as it's compact, light, and all but was surprised at how relatively expensive the 40grn .22mag ammo was.
The cheapest I just found .22mag on AmmoGrab.com was 2K of Armscor 40grn JHP for $258 plus $20.81 shipping to my home or 14¢ per rd (about the same as their cheapest 9mm). I still can handload my 125grn plated .357mag ammo for 13¢ per rd and while not much difference, I enjoy handloading, have all the equipment paid for years ago, have plenty of components on hand, and the 125grn .357mag loads are significantly more versatile with a much longer accurate range as well.
Bottom line on a .22mag levergun is that while I'd like to have one for the heck of it, it's just not cost effective to buy a new platform and the relatively expensive ammo it needs when I already have 2ea model 92 style leverguns and a SA pistol in .357mag.