I've invested in BOK already, so I'm that far in. Do I love the fact the sim is back in Russian hands only? No.
I would invest in Combat Pilot if they were to ... do *something* I could sink my teeth into. Having great looking ship-borne AA guns is fine, but it doesn't get me flying even a terribly limited plane set any time soon. Their monthly contribution thing is not my cup of tea, especially if it's not something I can do anything with at the current time. If their pricing structure will be a subscription (monthly or annually) it may affect my decision to support the sim. In the past I've enjoyed the opportunity to BUY my copy of a sim and buy add-ons as they come out. To subscribe monthly means to me that I should get some additional thing every month (a new issue) ... not just pay for the privilege of playing. If that's how it's going to go I'll likely not be flying CP.
CP's plane set is a major concern to me. Wildcats versus Zeroes had best be just the opening shot, to be expanded upon soon. CP needs to go well beyond the 1941-1942 plane set and cover most if not all the Pacific Theater combat areas. Both USAAF and USN aviation as well as RAF, RAAF and others (Dutch fighters made a brave if brief stand, for example) give the Pacific it's variety of flavor and different combat scenarios to simulate.