I own a 188-series Ranch Rifle. It's easy to customize a mini with aftermarket stocks and such, so mine looked like this when I bought it:
And currently looks like this:
But changing the stock is about a two-minute job, and can be done in 10 seconds if you have a spare heat shield and mag well liner installed in the second stock.
Pro:
100% reliable. I have NEVER had a rifle-related failure in more than 2000 rounds. The only failure of any kind I have ever had is when someone accidentally gave me some way-too-hot .223 reloads ("five grains over," he said!) that locked the bolt up tight from the excessive pressure, and I had to hammer the bolt open, IIRC. Loaded back up with the right ammunition and it worked fine.
Light and handy.
Fit and finish are good.
Very easy to take down, clean, and reassemble (though getting the bolt back in quickly takes some practice at first).
Con:
Accuracy. The best group mine has ever fired is 5.5" at 100 yards. I have read of people doing better, so maybe mine is worse than average. There are ways to improve the accuracy fairly inexpensively (new gas bushing, shorten the barrel to 16", add flash suppressor for more muzzle weight, glass-bed the stock); see the mini-14 forum at Perfect Union BBS for details. I just haven't had time or money to do that, but someday...
Magazines. I have some good 30-round mags and one 20-rounder, but finding one that functions perfectly in
your rifle is a bit of trial and error.
Misc: mini's are hard on scopes, probably because of the heavy op rod slamming back and forth during cycling. Not an issue if you go with iron sights or a quality scope, but don't use an inexpensive variable as it will likely not hold zero. Of course, that's assuming the rifle you're looking at has scope bases (Ranch Rifles do, regular mini's don't, but the regular mini has better iron sights).
On the whole, I like mine a lot, but if I had it to do over again, I would probably go with an AR-15 out of personal preference. The mini is a good rifle, though.