I am going to purchase a Z Tuesday and one of the local dealers has an AS that he will sell me for 6,000.00. I beleive retail is 6,999.00. I mow commercially, but have only recently gotten started in this industry. We have several 2 acre plus yards that we mow. The mower in question is a 20hp/52" . I noticed in most other manufacturers brochures this size mower comes with a 23 or 27 hp motor. The question is this. Is the 20 hp big enough or not? I know Exmark had to cut cost somewhere and the engine is one place. The other seems to be the pumps. All of Exmarks Z's use Parker/Ross and the AS uses Dan Foss pumps. I cannot find in the brochure any warranty info on the pumps. How does the Foss pumps compare to the Parker?