I have had two JK's and have only had a few issue's but they were caused by modifications and Very heavy wheelin, if you do not plan on modifing it then I doubt you will have any serious problems. You will get a LOT of people posting all sorts of stuff but it will really depend on what you are going to use the jeep for that will determine any issues that you might run into.
2009 Deep water blue 2door/ 2013 True Blue Rubi 4 Door
Factory 10 Chromoly shafts w/ Cold Forged U-joints & full circle clips.
TF disco's,TF Rocker Guards,TF Rear bumper, TF Sleeves & gussets
Airaid Cold air intake
37" SS M-16's
Incubus off road 17's
4"Teraflex and 1.5" Spacers
Front Rubi E-locker and Rear Eaton E-locker
All X up front bumper
Magnaflow Catback Exhaust
Bushwacker Flat fender flares
XRC-8 w/10,000lb synthetic rope
Rugged Ridge XHD front stubby bumper with hoop, RR front skid plate, TeraFlex Leveling Kit, Bilstein steering stabilizer, Bushwacker flat flares, Rugged Ridge 17X9 Satin Black wheels, Goodyear MT/R's 305/70/17, Mopar front air deflector, grab handles and door sill protectors, WeatherTech Liners, Shorty Antenna Source 14" black antenna, Hand trimmed rock rails and pinch seams, Drilled mirrors, AEV Procal
The first few things I noticed... the front windshield is a magnet for wayward rocks and can't take a hit at all. The dash is super soft and scratches easily. There was an article in this months JP magazine that covered the most common problems. Crush can bumpers, broken driveshafts, bent axles...
Leaky soft tops seems to be a big bitch-fest here, so you may want to avoid one if you live in wet areas.
2008 Jeep X Unlimited auto tranny with Black Appearance Package. Teraflex 2.5 inch coil lift with quick discos. 33x12.5x15 Goodyear Duratrac tires. MB72 black alloy 15" wheels. Teraflex steering stabilizer. Dual Sears Platinum batteries. Rugged Ridge Evap skid. Rugged Ridge XHD stubby bumper. Smittybilt XRC-8 winch. 6 Hella 500ff lights. CARR Rota light bar. Custom winch cover. My trailer is an M116A2 Army generator trailer.
<--- Hard top & Heated Seats. Only way to play in the snow.
But now it's time to take the top off, so off to that forum to see how I do this. Soft top was only on the vehicle for 3 weeks. I was too lazy last year, and it was great in Phoenix so the A/C works. BUT it's heavy, makes the Jeep top heavy. Glad I have a 2 door.
Flame Red, Khaki Hardtop, Black Soft Top
4.10, Sway Bar Disconnect, Axel Locks, etc. Standard stuff
Gibson Split Exhaust, Brute Force Air Intake, Unichip (doesn't work - took it out) , Daystar Upper & Lower with switches, Daylighter Lights, SPAL Electric Windows, Mopar Heated Seats (mmm warm nutz), Rugged Ridge Bumper. Ramsey Winch, LED Brake Lights, MOPAR 3 piece Hardtop, Teraflex Spring Spacers, Viper Alarm with remote start
CAUTION ! If your an individual that A) can't stand a little drip of water B) can't tolerate the slightest wind noise C) Bumps hurt your tush, or D) fancy yourself driving the NASCAR circuit.Then you may want to look elsewhere.