I am about to purchase a new mower, I can't decide between a Mini-Z 52" or a Hustler Z 54"? I am cutting just my yard that is 4 1/2 acres. I also concernd about seeing people on this site complaining about strips of grass being left uncut. Are these problems being addresed? I do not wish to purchase a mower and have to return it to the dealer because of a lack of performance.