Several guys on the Traxxas forum have used them- very good by all accounts. No more rear turnbuckles, though the toe-in angle is fixed at 1.5 degrees I believe.
I have RPM all around on my MAXX...v/ happy w/the parts
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S