I purchased this due to the fact I wanted a cover that provided maximum protection while being easy to use. Installed out of the box very easy. Has been up and running for a couple of weeks now and it is doing its job as advertised. Make sure you measure well it is very large and for sure takes up all the space in my third car garage bay. Very happy overall it's a well built product.
This is the second Technalon cover I've purchased (two different vehicles) both are of great quality, very soft on the paint and relatively easy to install and remove. I'm not sure if there should be another sub category for my 550i sport edition however, the cover could be a touch longer to cover the entire front air dam. Other than being a few inches short from achieving that it is a great cover.