I am looking at buying a parkerized 590A1, in particular, the 51668 for home defense. 3 more rounds for only 2 extra inches is really hard to beat! It has the 4-shell speedfeed stock. The 51663 is the same gun without the speedfeed. Anybody actually use the speedfeed and like it? Dislike it? Is an elastic sidesaddle just as good or even better? Seems like a $30 difference.