FWIW,
I've had good luck with the OEM ones, and the spacer/collar fixes to keep the swaybar centered...
I've taken the setup to the track, I max out steering locks pretty often negotiating the tight parking lot in my apt complex. There's this crazy curb that I go up to get to the local gas station, that definitely maxes out the swaybars, because I go up something like this:
1) right front wheel going up incline/driveway diagonally.
2) left front and right rear wheels go up driveway at same time (since I'm going up at about a an angle.), right front begins to lift off ground as I go near the top of the driveway/incline...
3) wait for it... wait for it....
4) my whole car tilts over on the LF and RR acting as fulcrums, lifting my left rear wheel at least 5" off the ground, and dropping the right front down pretty hard.
No, I'm not a racer, it's just the way the driveway is oriented to the street it's hard to go straight on.
Anyways, my point is I think I'm pretty hard on my swaybars, and never had any problems with them or the stock links.