I have Swans that are made near me in a factory in Osaka.
The lens is light pink and polarized (similar to oakley pink iridium) and it may not be better than 2 lenses but its not far off IMO. Does a great job in low light and sunny conditions.
Its so changeable here it would just be a pain to change lenses. I could be switching every 20 mins some days.
Either way good goggles are important and worth it IMO.