As it happens, I own a Beretta 92FS, a Ruger MkII, and a CZ SP01 with a Kadet kit, so I can speak with some authority on these guns...
1) The grip feel and layout of controls is significantly different between the 92FS and the CZ, so you're not going to get as much benefit from training with the CZ .22LR gun as you would with a conversion kit on your carry Beretta...but, you've said you want a complete .22LR pistol and not a conversion kit, and if you feel that the CZ is close enough to your Beretta to satisfy you, then that's perfectly fine.
2) The Ruger pistols, particularly if you can find a used MkII in good shape, are excellent .22LR guns. The field-strip/re-assembly procedure
is somewhat tricky, but it becomes easier once you learn the knack - it helps if you have the manual in front of you, and you THOROUGHLY READ the procedure(as opposed to "skimming" over it, as most American men are wont to do with owner's manuals) as you go. On the other hand, I know from personal experience that Rugers will run quite reliably for well over 1000 rds between cleanings, and even then, dis-assembly is not really necessary - simply lock the bolt(slide) to the rear, remove the grip panels, hose it well with an aerosol powder solvent like GunScrubber, pull a BoreSnake through the barrel from the breech end, and add a couple of drops of oil through the open action to lubricate. If your conscience dictates that you clean the gun more thoroughly, the Majestic Arms "Speed Strip" kit(
http://www.powercustom.com/parts_mkII.htm) can make the process significantly easier, though I haven't felt the need for it myself.
3) Magazines for the Ruger pistols are ubiquitous and relatively inexpensive, and are IMO easy to load, especially when you use the side button to depress the follower. If that's still problematic, several companies make loading tools for <$10 to help you depress the side button more easily.
4) The CZ Kadet(whether you buy a complete pistol, or install a kit on an existing pistol) is VERY easy to shoot, has a particularly ergonomic grip and control-layout, and if you are willing to spend an extra $160 for a CZ Custom Shop trigger job(
http://czcustom.com/sanditriggerworksada.aspx) you can get a truly competition-grade trigger pull on your gun. My Kadet kit happens to give perfectly acceptable accuracy and reliable functioning with inexpensive bulk .22LR from Federal and CCI. I also know from personal experience that the Kadet will run reliably for well over 1000 rds between cleanings, and field-stripping/re-assembly closely parallels the centerfire CZ pistols - which, by the way, is significantly easier to do than the Ruger .22 pistols. Another point of comparison is that my particular Kadet kit seems to shoot more accurately than my particular Ruger MkII - I've been known to put 38 or 39 shots out of a box of 40 Federal .22LR's into a 3"X5" index card @ 20 yds(standing, two-handed, 1 shot/second "rapid fire") with my Kadet, versus 34-36 out of 40 with my Ruger.
5) Magazines for the CZ Kadet are NOT inexpensive($37/ea,
http://czcustom.com/CZ-75-Kadet-22-10-Round.aspx), hold only 10 rds despite being as big as a full-size 9mm CZ75 magazine, are NOT very common(the CZ custom shop website shows they are Out of Stock), and they can be difficult to load for people with arthritis, hand-strength issues, or dexterity issues; there is no button or lever on the Kadet magazines to depress the follower, nor is there a tool to do same - you have to use the rounds to depress the follower, just like on your Beretta mags, except that .22LR rounds are smaller and trickier to handle than even 9mm's.
6) Manually locking the slide back to show clear can also be tricky - the Kadet's slide is a relatively thin slab of steel, and it can sometimes be tough to get a good grip on it despite the gripping grooves. Also, for me, using the tip of my right thumb to engage the slide-lock lever sometimes causes the safety to get pushed upwards by the knuckle of that thumb, which causes a mechanical conflict as the safety wants to lock the slide in the forward position at the same time I'm trying to pull the slide back.
The only (somewhat) real negatives I can come up with for the CZ Kadet are limited to the magazines and the slide manipulation, and if those are non-issues for you then you will be well served by that gun.
However, I should caution you that any money you
think the Kadet will save you will probably be offset by the increase in range fees, purchase of targets, and fuel consumption that results as you go out shooting the CZ as often as you will want to...