HS is now offering a new variant of both the Evolution and Infinity lines. Below is the blurb from the Evo CRplus - identical variation on the Infinity. Costs about an extra $50. Never heard about the allergy business, but could the new seals worth the penny for someone buying a new brush?
The Evolution CRplus combines elegance with maximum Resilience:
It has a high-quality triple-coated with chrome-finish.
In addition to the optimized design minimizes the chrome especially the
risk of allergies those problems which the previous nickel devices could
cause.
A further advantage of the new CRplus series is an
innovative longlife needle seal consisting of three solvent-resistant
PTFE seals distinguished by a new type of screw technology. The longlife
PTFE seals provide reliable protection against the undesired emergence
of air and paint also on the cup screw fitting, nozzle and valve.