Depends on what you find an big issue Henkka.
Yes, but i look at the things in little bigger view than just myself (I use W7), I see in "vistors of the site"-view. Actually about 45% are IE-users of wich 50% use older versions than IE9. Thats quite a part of all visitors. And this in a country where IE<9 user-rate are low, in middle of Europe are the rate far bigger.
Its also a managing thing, if you want to do doublettes of everything instead of creating a page what works also in IE8 (i don't care about IE<8 ), and then do double work, its your choise. I have many times allready said IE should be forbidden by law, its a pain in **** for coders with my own scripts, but have tryed to have them as IE8-compatible as possbile alltought as so many of visitors still use it.
Personally i should use much more HTML5 and all its cool stuffs if just more browsers should support it.
Keep your website "old-fashioned" to satisfy all your users
Can you call my site old-fashioned?? I should say no, and it still (almost) IE8-compatible.

Its more a question how you as coder tackle the IE8-probleme than nothing else.
At the end, those gauges are fully possible to get working also with IE8 and lower if wanted, its just question to be creative and learn the basics of <canvas>. And before you ask, Google is your friend in that case, so i learned it too
