My wife gave me a DC 3300 for Christmas just after the product was introduced. That must be the better part of 20 years ago. She had an alternate motive in that her laundry area also shared garage space. This machine is still running like a charm. I started to replace the fan, thaikin that it must be worn out by now - but after partial dissembly I could not detect the slightest wear in the original fan. Will a Jet and some of the other units on the market perform as well over the years? If you need a replacement fan or parts for a Jet in 15 years will they still be available?
Most of the dust collectors at Woodcraft and other places are designed for permanent installations where the dust collector is at the termination of a hard piped metal or plastic ducted system. This could mean that the machine could be 15 or 20 feet away from the dust collector. the cfm loss in these kind of distances is significant, thus these dust collectors have 1 1/2 HP or larger motors. This gets us into another problem regarding adequate electrical capability. At a minimum, a 1 1/2 HP dust collector would have to be on it's own 20 amp circuit. This would be the way to go if you are setting up a 1000 to 2000 sq ft shop with a 60 to 100 amp sub panel.
The Shopsmith is competitive with some of the 1 HP dust collectors. Woodcraft has a Jet model 650 that is $300 and is portable. It advertises 650 cfm. However this is with a 4" opening. Once you put a 2 1/2 inch adapter and hose on it the cfm will drop drastically.
The Shopsmith, with it's 2 1/2 inch openings is rated at 330 cfm. I'm assuming that this is it's rating with one hose section. Various cmf requirements are listed in Taunton Press's "Small Woodworking Shops" section 4, page 107. They are as follows;
10 inch tablesaw ........350
6 or 8inch joiner..........300 - 450
12 inch planer.............350
14 or 16 inch bandsaw..350
Radial Arm Saw............350 - 500
12 inch disc sander.......350
12-24 inch drum sander..300 -500
Oscillating spindle sander 350
So it would seem that the DC 3300 is adequate for most of our machines if we use just one length of 8' hose.
With the DC 3300 we do have slightly more suction if we close off the other two openings. Maximum cfm however will occur with all three ports open, no hose attached. This would probably even significantly exceed 330 cfm and would tax the motor to it's fullest load, perhaps even overload the motor.
Hope this helps.