I bought ours here
http://www.rvawningsmart.com/I had a positive buying experience and like the awning. The only thing I have noticed is the material may be a little softer then the original Dometic. However the old Dometic I took off was 10 years old and may have been stiffer from being more brittle. I do not recall the softness of it when it was new so really cannot compare new to new.
Make sure the thickness of you replacement awning is at thick or thicker then your original. Some replacement awnings have been only 1 ply/sided which is 1/2 the thickness of many originals.