So I realize the vast majority of these have been covered in the 300+ page thread, but thought I'd list a few of my experiences anyway.
One of my favorite items (part number 47246 is long discontinued) is the 3000 lb aluminum rapid pump jack. I've had it about 8 years and it's great. Doesn't really get high enough for big trucks but that's not what it was intended for.
Electric angle grinder - another thing I've beaten up (as a homeowner) pretty good for over 10 years and it's held up extremely well.
I believe this is the comparable current one:
http://www.harborfreight.com/heavy-duty-4-1-2-half-inch-angle-grinder-91223.html
Oscillating multitool - I have owned this a while, too. The blades kind of ****, but the tool itself is great. Used it for installing hardwood floors several times with no issues.
http://www.harborfreight.com/oscillating-multifunction-power-tool-68861-8493.html
As far as pneumatic tools, I've had mixed results. The straight die grinder and right angle grinder are great. I tried the 3/8 air ratchet and it blew a seal within 5-6 bolts. I was not impressed with that.
I have not tried their pneumatic impacts as I already have several, but the electric impact is great for lugnuts, etc, if you don't want to turn the compressor on.
The cheaper set of taps and dies are garbage.
http://www.harborfreight.com/40-piece-sae-carbon-steel-tap-and-die-set-39391.html
I keep them around only in case I need to chase a hole and I don't have the right size in my better taps. They won't cut a thread in butter. I have heard the TiN taps are better but can't comment as I've never used them.
I have a few of the hand tools like the nut drivers (I like the handles on those but the tips sometimes seem shallow?) and I have some wrenches in my junk travel bag that I picked up super cheap that have never let me down. I also will get one time use tools there for household projects. I needed a basin wrench and picked it up there and it was fantastic, and way cheaper that a nearly identical one at Menard's.
Most recently I bought some toolbox trays and screw organizing trays and they are all of good quality.
http://www.harborfreight.com/abs-storage-organizer-95807.html
http://www.harborfreight.com/15-bin-portable-parts-storage-case-93929.html
http://www.harborfreight.com/3-piece-drawer-organizer-set-99731.html
Overall my experiences at HF are 95% good. I think as long as you know what product you are buying and what to expect, you're in good shape.
Matthew