Acoustic Revive RST-38 or RHB-20 isolation platfor

I am looking for a good isolation platform for my turntable. The usual suspects are HRS/FE/Symposium. I was wondering if anyone has tried or auditioned an Acoustic Revive isolation platform ? They have a cheaper model, the RHB-20 and a more expensive model the RST-38 which has quartz filled in it. I normally find Acoustic revive as brand that is quite expensive but also effective. They use natural materials and always emphasize in getting natural sonics. I would like try one of their platforms but before putting down cash, wondering if anyone can give some feedback on these products.

I am not looking for spend more than $600-700 on the platform, hence ruled out the more expensive ones.