They're definitely not flimsy. And on a 93, they don't have any effect of making the recoil more, punishing, shall we say, like on a 91.
But I don't think anyone will argue that they are as good as the A2 stocks when it comes to precise, aimed fire. You can't get a very good cheek weld with them. But flimsy and problematic they definitely are not. They're very solid and work well for their intended purpose of making the rifle as compact as possible.