The Vac Master Units are great, I looked at them when I was shopping for a sealer. I went with the Weston 2300 so I could use containers for marinating and bags for storage. I also like the readily available rebuild kit rather then sending it back for repairs.
I have heavily used my Weston without any problems.
But as Swamp Donkeyz BBQ States, "You Get What You Pay For".
The Vac Master is nice because the whole pouch sits inside the Vacuum Chamber.