I have been happy with my tractor so far. I purchased it with 12 hrs on it including the FEL for under $9,000.00. It was from a dealer liquidation and so I did not get a warranty with it. I use the tractor for mowing 3 acres with a 6' finish mower, trail mowing with a 4' bush hog, grading a 600' gravel drive, as well as using the loader and pulling a 5' x 10' trailer with fire wood from our woods.
Overall it has been reliable though I have found a couple of quirks. First, be sure you have the updated filter adapters and filters on the hydro (since you are looking at a 2007 model I'm sure you do). Second, you already know about the loader bolts - not a big problem since you are aware of it. Also check the front drive shaft - mine came loose and fell out. Third, you may likely encounter starting problems which can be easily remedied - see near bottom at
http://www.tractorbynet.com/forums/cub-cadet-yanmar-cuts/157287-cub-cadet-6284-power-take.html.
The parking brake has issues - see
http://www.tractorbynet.com/forums/cub-cadet-yanmar-cuts/162820-parking-brake-wont-stay-set.html. I adjusted mine but have never got around to installing some type of return spring so I have to reach down and pull the brake pedal back when I release it. Not a big problem, but annoying.
Also do not use the amount of engine oil recommended in the user manual when changing oil - you will overfill it by more than a quart. Instead install about three quarts, start the engine for a moment, and then check the level using the dipstick and top off.
Again, for what I bought the tractor for I have been satisfied. I would have had to pay almost twice what I paid to purchase similar in another brand. While I have had to perform a number of fixes none of them has been major. I've read the threads of other brands where people have had their share of issues also. If you are going to run rear mower decks or other rear equipment invest in front suitcase weights to improve front wheel traction - a good idea for any 4 x 4 CUT.
When Cub struck a deal with Yanmar to make their new models they dumped a lot of 6284's to move them from dealer inventory so there were some really great deals around for a while (mine being one of them). That really lowered the market value on them for a while and I'm not sure it ever really recovered so shop around to see what you can learn before you purchase. While the market value may be lower it also made it possible for me to purchase more tractor (virtually brand new) than I could have found used in any other brand.
JN
BTW - You may have experience already with quick attach FEL's and this is something that is not unique to 6284's, but the following link might save you hours of frustration if you are not aware that sometimes you need to bleed the quick connect lines when hooking up - see near the bottom of
http://www.tractorbynet.com/forums/cub-cadet-yanmar-cuts/176491-quick-attach-bucket.html.
