So far I've read only their online articles and found them very interesting. I'm not subscribed but I've seen occasionally some issues of WW2, Aviation History and other magazines from this publisher in some better book stores in my country.
'Combat Aircraft' is a good choice if you're into modern military aviation. I would also recommend 'Flight Journal', but lately the magazine has become so reduced in content that I'm seriously thinking of dropping my subscription.
Aeroplane and Flypast are my regulars for European magazines.
Two Australian publications Aero Australia and Flightpath are excellent and infact Flightpath is my favourite, only a quartly magazine but always has a lot of information inside.