For the longest time, I was not the happiest with the Case knives I would get. SS was worthless, to me, and CV would rust if you looked at it cross eyed. Queen's steel was great, if you could find a knifemaker to sharpen the D2 for you (thanks again Scott). Great Eastern was an all around good knife, but watch out for those springs, you would lose some fingers!
As I have gotten over a lot of my "knife snobbery", I have come to really appreciate the slipjoints I have. The Case Bose line is about as close to a custom knife as I'll get for the forseeable future. I have a coffin jack coming today or tomorrow, and a Tribal Spear at home. The Tribal is a great knife, would make a great EDC if I wasn't so afraid of losing it

. I also have a humpback stockman and Case Bose backpocket, both in SS, and a few passes on a strop, or a pair of jeans, and you are back in business (only complaint about the humpback is the hard to get to spey blade). Last but not least, my small peanut continues to amaze me at how useful it is (thanks again Carl for pointing me in the right direction).
Most of my Queen knives were dull or had a crappy edge. The recent ones I've picked up, including the Dan Burke collaborations, Schatt and Morgan (Heritage and File and Wire), and a canoe and Mountain Man slipjoint were all fairly sharp (popedandy, did you put those edges on the FW and DB's?). Most of them have great walk and talk, no bad knives in the bunch.
My first GEC was a very tight 73 trapper. It has loosened up over the years, and a few of my recent acquisitions were super tight to begin with. They have loosened up to a tolerable level. They do not appear to be striving towards "loosey goosey" either

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If you want a Schrade, go old school USA made. Great Eastern made a few of their's, but most Schrades are made overseas now, and are of poorer quality.
I would check out Bucks line of slipjoints. I found an old 301X with bone scales at a gun show, there are lots of variations out there. Stick with the older 440C, 425M and newer 420HC models. I picked up the small stockman and single blade pen knife bone scale set at Walmart, and saw that the steel is 420J2. Those two will go in the gift pile...
I had a Canal Street Canittler, a bad mistake to give it up. Very well made knife.
I have some of the older Remingtons made by Camillus from the 80's and 90's, and a fair amount of Utica and other older slipjoints. Take a copy of Levines Guide or the Blade guide, and find some old knives that are not in good enough condition to hide in a display case, but good enough to clean up and carry.
I am really slowing down in regards to my other two knife areas of interest, modern one handed openers and custom fixed blades. Don't see myself slowing down on slipjoints anytime soon.