I was ready to purchase a new Hustler Fastrak SD when I noticed I could get an Exmark Lazer Z E series for $1000 more than the Hustler. I have 4 acres of mostly pasture (read aggressive invasive weeds). The dealers are both close and have good reputations. I can manage another $1k if there was a substantial difference in performance, ease of maintenance, durability, etc. Thanks for any info in what differences I can expect between the two different machines.