It's not that the flavor changes, you just get more flavor in some vaporizers than others. I think the hotter burning ones make the vapor "thinner" where the "denser" vapor carries more taste.
Some flavors you can't really notice it with but others you can. For example, Peach tastes about the same in all three that I have (801, 901, 510) - but you can taste a big difference in subtle flavors like cheesecake and banana.
In my opinion on a scale of 1-10:
901: Flavor 10, Throat Hit 6, Vapor Production 7
510: Flavor 6, Throat Hit 9, Vapor Production 8
801: Flavor 8, Throat Hit 8, Vapor Production 10
Oh, and if you are on a budget - the 510 and 801 go through liquid at about twice rate of the 901. My favorite overall is the 801 but it's kinda big.
Some flavors you can't really notice it with but others you can. For example, Peach tastes about the same in all three that I have (801, 901, 510) - but you can taste a big difference in subtle flavors like cheesecake and banana.
In my opinion on a scale of 1-10:
901: Flavor 10, Throat Hit 6, Vapor Production 7
510: Flavor 6, Throat Hit 9, Vapor Production 8
801: Flavor 8, Throat Hit 8, Vapor Production 10
Oh, and if you are on a budget - the 510 and 801 go through liquid at about twice rate of the 901. My favorite overall is the 801 but it's kinda big.