Salk Songtower upgraded factory spikes?

Just received my Salk Songtower QWT and was wondering if anyone has them and upgraded from the plastic factory supplied spikes. If so what did you use and did you see a difference?

Plastic spikes? I liked the Star Sound brass ones so much I became a dealer for them. I replaced the steel spikes on my Sound Anchor and Skylan speaker stands with them and put them under my REL subs; it made a big difference. A friend just replaced the standard spikes on his new Tyler Acoustics speakers with them. They are not cheap but neither are the competing products. That said, I think any good metal ones would be an improvement over plastic.