Meshboy, both simulators offer many things which the other doesn't... there are addons out there for FSX that surpass anything done in XP to date, but this is because it has the attention of developers that have literally hundreds of thousands of dollars to spend on making addons, you can't expect that same level of detail and accuracy from developers with a budget in the low thousands. The biggest thing that keeps me from completely switching to XP is the weather modelling (when will we see a program like OpusFSX for X-Plane? Long overdue!) - no extended terrain textures (never fun flying high altitude and seeing the horrid green or blue blob on the horizon in XP, XP is great for flying under 20,000 feet though!) and the extremely primitive base airport scenery. When compared to FSX, these 3 things have kept me and many other dual users I've talked to on the FSX side of the fence for a while longer. However, one thing that keeps me coming back are the great addons coming out like those that JRollon, FlyJSim, Carenado (they're milking the FS cow, with products for all 3 major simulators, go Carenado!!), DDenn and Twinpropflyer make. On another forum I visit I have often said that I would buy X-Plane just for these addons... but to say X-Plane has completely passed FSX is a bit far fetched to me, someone who has thoroughly enjoyed both product lines in some way or another since the 90s. But I believe that it will definitely surpass FSX in the future, it's our only real hope right now for a civilian flight simulator, and that pretty much guarantees it.