I have a lot of wobbles, here's my take - Non-wobble plus is generally the way to go, especially if you're trying to work the socket onto a rusted fastener.
- SK are my favorites, 3/8 and 1/4, no failures I remember, and it's been a few years.
- Snap ons 1/4s are wobble plus, very nice, better knurling than SK. No failures yet (recent acquisition)
- Koken 1/4 have top notch knurling, but I had one snap on my m12 ratchet (warrantied via Franks Tools), and then a detent ball failure on another. Current plan is to just use them until they fail and throw them away. Hopefully I just got a bum set, I really like them aside from those two issues. I like a lot of Koken stuff, I'm just not sold on extensions.
- Gear wrench 1/4 is probably the best value, has poorer angle than the others. You're not going to be cranking on them with long ratchets, but they do work. I snapped a few of these off, then went to SK.
- Craftsman 3/8, got a discounted set to meet a free shipping requirement. Purchased them for home use as I figured they would die a quick death at work. They have maybe 10 degrees of angle, if that. I would avoid; I'm hoping to relief cut them with a grinder for some workable angle.
- Harbor Freight 1/2 and 3/8 impact. I recently purchased a sunex set as the ends of my 1/2 drive set look like they're starting to wear, after 4 years of use. Made a lot of money with these, and they cost nothing. I would recommend these in general. I would have just got another set for the eventual failure of my current set, but the Sunex were Amazon Warehouse Deals for a similar cost.
I think that's all the brands I have, everything but the craftsman lives at work. Gearwrench has been retired and should really come home. Frankly, I often abuse my 1/4 extensions, SK has been great to me. I baby the Kokens, which failed under average use. Snap-on have the least likely-hood of being detached from a socket which sticks to a fastener. Sometimes you just need to hit stuff with the wire wheel before it goes back in or the socket is never coming off.