Better plastic design I guess, I never personally tried out the Mavis 500 since those are not carried in Canada either (US has them). You can get Mavis 300/350 at Tad's. I get my 300 Yellows from there.
i think the 370's are way too light, they fly out of the court so easily... not really a good shuttle to be honest... even if it is more expensive the 300's are just perfect
Personally, I havn't tried any other plastic shuttles made by yonex other than Mavis 500. Any special characteristics between each model? Weight? Design? Feel?