What do you like?
Rolled Spring steel with precsion ground tips. When I first got in to the hobby I went through quite a few sets of wrenches because unfortunately they were all crappy die cast wrenches. Sure some of them tried using a different material for the tip or TiNi coating etc but in the end those were very minor improvements if at all. It wouldnt take maybe two to three months of wrenching before the tips would start to round off which Id noticed when my allen head screws were start to get tore up. Soon as I saw that happening Id check my tips and sure enough.... Just some of the sets I can remember running through were OFNA, Rubber handled Dynamite, Metal Handled Dynamite, Losi 8 in 1 (7 in 1? Something like that), Integy, Align, and there was some no nam brand crap I bought off of eBay once.
Then I discovered Hudy. Hudy was where I first leaned about rolled spring steel with ground tips but Hudy is like the Snap-On of the RC word. Everyone that I came across in various forums that had or had used Hudy all swore by them so I decided to try them out. Well needless to say I was shocked when I realized they were damn near $20 per wrench but I was tired of stripping screws and replacing wrenches so I decided to buy the two main sizes I used the most and give them a try. After about 6-8 months or so I was convinced that they were superior to all the others I had tried so I wanted more of them but back then my RC budget was a hell of a lot tighter than it is these days so after doing a little digging I found another company that made wrenches with rolled spring steel and ground tips called Team EDS. Team EDS wrenches were priced about half of what the Hudys were and much closer to the cost of most of the other die cast sets that I had used before so i decided to give them a try and bought a 4 piece metric set. When I first got them I compared them to my Hudys and the tips themselves were pretty much indistinguishable from the Hudy tips. I even read in one forum that they were made in the same factory as the Hudys were. I dont know if thats true but I couldnt tell the difference in them other than the handles being a bit different. Fast forward to 10-12 years later and not only is my original 4 piece metric set in near mint condition but I own probably 85+% of Team EDS's entire line of hand tools.
Everything with the red aluminum handles and the circled 1/4inch driver bit are all Team EDS
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Everything in the white 3D printed holder including 1/4 inch bits and turnbuckle wrenches are all Team EDS
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and can't forget these two guys off by their lonesome in the corner of my pegboard. You used to be able to get them with custom engraving on the handles but they dont offer that anymore.
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All that being said I've never looked back from Team EDS so I havent tried MIP, Wiha, or Bondhus even though I've always heard they are quality tools.
What don’t you like ?
i dont like die cast tips, rubber handles, or T shaped handles although those last 2 or just a personal preference of mine.
Who makes the best sets? Can they provide replacement blades?
The only 2 quality manufacturers I have first hand experience with is Hudy and Team EDS and they both have repalcement tips you can buy.
Can you use a grinder and reshape the tip so they can be used after there damaged?
I wouldnt think so because even if you had the ability to precision grind them youd have to take off material and then you would lose your tolerence for a snug and proper fit in the allen head. That being said I'm no expert in metalworking. Just an educated guess on my part.
When do you replace the tips?
when they start to get rounded but the only time I've ever had to replace tips on quality tools was when I broke two 1.5mm wrench tips trying to break red loctite free on a chassis brace.
And then there is the Allen bolts themselves.
Where do you get them?
My first go to is
https://www.microfasteners.com/
Second go to is
https://www.rtlfasteners.com/RC/r2.html
If I have to keep looking my next two stops are these
https://www.boltdepot.com/Default.aspx
and
https://www.mcmaster.com/
How do you sort and store them?
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Are stainless better than black steel.
The only good thong about SS screws is they dont rust or corrode but I dont use them because they are much softer than the alloy steel screws.
Is titanium worth the price?
Dunno, never used them.