Mike - I've not yet tried the Skis, but give me 2 months and i'll let you know!! The kids want a pair of the attached training ski's for this summer.
I'd have to agree 100% with Pat (imagine that, I agree with Pat!) that it REALY depends on the load. I've been pulling tubes with my 175 with a 40hp for 4 years. ONLY problem was a friends 250lb teenager, i could NOT get that kid up on that tube (or my boat on Plane) with out a LOT of strategy!! ONLY way I could do it, was to have a LOT of slack tow line, take off going SIDEWAYS to give me more room to get on plane and then YANK that kid up!!! Now i've since installed a SE Sport 200 foil so I don't know how much it will help.
But if we're talking the kids 1 at a time, probably, adults - don't think so, unless as Pat mentions you get a different pitch prop with a LOT of lowend pull.
Trep