We use these in the ECP/Beezar Audio T3:
https://www.hificollective.co.uk/components/mcap_evo_oil.html
I can't speak for the others, but they're definitely better than the Clarity Cap SAs and miles ahead of Solens. Other builders started using them first, but we agreed and started using them as standard in the T3. Their greatest strength is transparency, almost to the point of being audio-invisible, which is what we wanted in the T3. Other caps may impart some bass or mid-range bloom. Conversely, these let everything through with little to no sound of their own, but with gobs of micro-detail. They're fairly economical and available on ebay as well - look for ebay seller "amplifier_surgery." I've been told the silver-gold versions are even better, but not at more than 5 times the cost. Be careful and note that the EVO caps come in three versions - Aluminum, Aluminum-Oil, and SilverGold-Oil. The Aluminum-Oil are the ones that hit the sweet spot between performance and price, IMHO.