I've used Battle Version, SPL, and SPC (non-heim) arms and would recommend all of them. The heim arms I had for years and years and were still so tight that if I unbolted everything and let them sit parallel to the ground, they'd stay there for weeks.

I think the feedback from Ken/Enjuku is very valuable. No returns in 1200 units is very good for just about any performance part. Despite the personal bias that some might have, I think we're really lucky to have a shop like Enjuku that keeps track of these things and puts effort into research.

I think the longest continuously used arms I've seen were the JIC set on SCC's old Project Silvia. That was 2002 when they put them on and Dave just rechecked them recently to find that they're still tight and noise/play free. Not bad for an unsealed heim!

One last related thought, I've used "Def's RSB" which are the spherical bearings you press into the uprights. Once you go full heim, they're an incredible upgrade to finish it all off. The bearings are very durable, and the significant reduction in suspension bind is easily felt in the driver's seat.