I have the Excel 1 kit from Veneer Supplies, which is a 1.4cfm pump. Probably similar to the VacuPress 150. Honestly, it's worked well for me. The VeneerSupplies site says it shouldn't be used on bags bigger than 4x4. The Excel 3 is the 3.5 cfm pump for bags up to 4x9.

https://www.veneersupplies.com/produ...ss-System.html

If you already have a decent sized compressor, you may look at one of their auto-cycling venturi kits. Could give you more bang for your buck.

I'm happy with the small pump, but if I were going to do it again I'd just start with the 3.5cfm pump to make 4x9 sheets possible.