All of my Saitek sticks still work 100%: X-36 USB, X-45, X-52 Pro. I have a Thrustmaster Warthog now as well. I like the X-52 Pro stick the best. I love the Warthog throttle, but the stick is stiff and has center detents that make find movements around center extremely difficult. I am getting used to the Warthog and love the Target programming software. The X-36 isn't supported in Windows 7 (it works but no driver for the programming software). The X-45 has been cut up to work with my real F-4 Phantom stick. I use that for flying F-4 Phantoms and other jets in Strike Fighters 2 series games., but use the Warthog throttle. The X-52 Pro is now my son's stick since I but up the X-45. The X-52 Pro throttle has great ergonomics and the thumbwheels are great fro trim control, but the Warthog throttle is a dual throttle and has an awesome selection of switches. If all of my sticks suddenly failed right now, I would get an X-52 Pro or maybe try a CH stick. I don't care for the CH pedals or throttle. Even with the great deal I got on the Warthog ($350 vice the usual $500+ retail), for me it is at best equal to the X-52 Pro unless you really like the feel of cold steel.
I understand (as posted by many above) that a lot of people have reliability issues and durability issues with Saitek sticks. So, I must be lucky. The X-36 was bought in the fall of 2000 and was my primary stick for years before I got an X-45. The only reason I bought the X-52 Pro was that it was on sale for $100. The X-45 spring centering system was annoying. The X-36 was much better. The X-52 Pro largely gave me back the smooth light feeling of the X-36. I have Saitek rudder pedals, so I don't need/use twisty stick or rudder rocker. But, I think I liked the rudder rocker on the throttle of the X-36 and X-45 throttle better than the twisty stick setup of the X-52 Pro. Warthog is useless without rudder pedals. None of the available axes on the throttle make a good rudder control and the stick is not a twisty. I am glad I have rudder pedals or I wouldn't even bother to use the Warthog!