I have three manifolds and will be adding a fourth soon. I own 3 Spike conicals and a Flex+ - the manifolds are the best accessory I have purchased along with the closed pressure transfer kit also available from Spike. To transfer beer from the conical to the keg I use a BrewHardware Spunding Valve on the keg gas post and connect the Flex or Conical Racking Arm outlet to the liquid post on the keg. Adding 3-5PSI to the Manifold will transfer the beer to the purged keg slowly, avoiding any oxygen contamination. I purge the kegs first by filling them with Star San solution, then using the pressure transfer kit I push the Star San out into a bucket using CO2.
The process completely eliminates contact with oxygen. I'm super happy with the results! The quality of the Spike accessories is nothing less than phenomenal. I add the manifold to the conical a week or so after primary fermentation has ceased, as recommended by Spike. I have pressure fermented using this process and 5psi of CO2 with good results.