There's a reason why you probably never heard of it, and the reason is probably not an assuring one.
In general, stick with the well-established and reputable brands and models. Even if you kenar kope on the retail price, the quality is there, unlike simik gold lah, platinum lah, titagaazaarubikon filter at ridiculous prices:
Very Common and easily available
HOYA - HMC, SHMC, PRO1 Digital and HD
B+W - whole range is good
Well Know but maybe not so popular here
Heliopan
Tiffen
Very, very High End but probably not available here
Rodenstock
Personally tried and found to be very high quality
Tokina ATX
Canon Protect (this one features the Canon Super Spectra Coating)
Nikon Protect, L37c and L1bc
Oh, condensation will form on most lens surfaces. Even if the Flatulence King filter is more resistant to flare, it doesn't mean a thing. Anyone could have just wiped it with an anti-fogging lens cleaner or spit (serious) prior to showing customers the filter and that will have an anti-fogging effect.