I was thinking of running a pair of knave E-wings in my latest list.. then i realized that a rook w/ a stealth device is really a 3 point cheaper knave E-wing. Sure there are a few differences, like a couple upgrade options / actions / and PS.. and the fact that the SD can be destroyed. Not to mention a few dial differences.. I know sounds like a totally different ship. But really, I'm thinking I'd prefer the rook over the knave any day as I like to be as thrifty as possible with my 100 point lists.
With that being said, this leads me to believe that the knave squadron (27 pts) is actually really well priced for what you get. Good stats, some decent upgrades, a better dial and more actions as we all know the rook is a great bargain and SD is a popular upgrade for most ships (though usually with agility 3 ones..).
Small disclaimer: I understand that most ships are actually just cheaper / more expensive versions of other ships.. ha