They work extremly well here in 100 degree Texas as well sub zero South Dakota.
http://www.ableautoglass.com/Silblade/Silblade.htm

However, I have switched to the Bosch Icon and Valero recently due to what I consider a better design and am happy with them but have only been using them for about 6 months.

http://www.tirerack.com/accessories/valeo/ultimate.jsp

http://www.autohausaz.com/html/wiper_blades_icon.html - I don't see a VX fitment on this web page but they are sold individually so you should be able to get ones to fit. FYI, you can go an inch longer than the stock length and still not have them hit one another.