Anyone own or use a Ferris model 320 mower? It is the 3 wheeled out-front type with a 61" deck and 20hp Briggs Vanguard engine. Are Ferris products reliable? I mean are the decks of good quality and the hydro system durable? I have never owned a vanguard engine, how do they compare in terms of reliability with other common v-twins? The particular mower I am looking at has less than 400 hours on it. I just wanted information from Ferris owners before I buy. Thanks.