Personally, dont have a real problem with dust...not saying that I dont any, i do and have done!...just need to that extra careful when changing len's...first time is nerve racking I must admit...but after a while, comes second nature. I use a good Rocket Blower brush. Best time I do it (if its major dust)...is first thing in the morning when the sensor is not too highly charged! Some cams attract more dust than others, but imo, nothing that Photoshop Healing brush cannot handle. One way of checking is to take a shot of a blue/clear sky. But really, imo, nothing to get too paranoid or worried about. Just wish there was a thing called Dust Free Earth..lol