VC17 Alternative

Anyone have first hand experience using the West Marine FW-21 branded substitute to VC-17? Is it made by interlux or another vendor? Aside from the sale price difference of 20 dollars, is there any benefit? I hate to be save a dollar now, only to spend two later on. Thanks!

I have used it the last two years. It is WM's house brand made by Petit.

Has performed better than the last lot of VC17 I purchased in the sparkling clear fresh water of western Lake Erie.