There is, as Ian says, a lot to like about BoS, even in these early stages of development and it is clear to see it's RoF lineage. However the acid test, ultimately, will not be how the aircraft perform in isolation but how they compare, one to another. The feeling of flight in the Lagg is great and it performs in a believable manner. It will be interesting to see, and possibly the bit of the sim that the Developers will be most nervous about next week, how the lagg compares to the F4. With no shooting there will, inevitably, be lots of testing, one aircraft against the other, performance wise. Ultimately if there are found to be deficiencies in the FM's it will matter less if all the aircraft suffer to the same degree for the same reason than if they are isolated problems. To put it another way, it matters not if one aircraft rolls 2-3 seconds faster than it should,if they all roll 2-3 seconds faster than they should. The problems arise when errors in calculating FM's give a performance that negates the benefits, deficits of different aircraft. There was, rightly or wrongly a lot of griping about this in RoF, hopefully with far more fulsome data on the subject aircraft and far less guesswork we will be able to see the true nature of the digital nature engine and how well it performs given that there is far less guess work involved in creating the FM's. It would be interesting to hear from their creator, I'm sorry I forget his name, about how it compares producing the FM's for BoS as opposed to those for RoF. Presumably it's far, far easier.