The K-force Light 386 is a great chainset that I have been using for a several months now, strong and light and still as new. Most of the downsiding is done by people with no real experience of them, they won’t fall apart if a twig hits them, rings are available though not as easily, they can be used with other bottom brackets. One of my sets (I have two) is used on a Giant Anthem BB92 Shimano press fit and works fine. The other bike uses the ceramic bottom bracket that comes with it and both work fine with no problems. You can see why FSA state that it should only be used with the correct bottom bracket because it sells for £150+ and is money in their pockets. Don’t believe everything you read on forums its mostly hearsay.