The structural ribs on the CRJs intrude into the windox pax's space. Also, on the CRJ-200s, the windows are very low, and, as has been noted, if you're taller than about 5'0" you will get a better view from the aisle seat. On the 700s and 900s the windows are located significantly higher and give my 6'0" self a very good view unless over the wing.