They'll do the job, but a couple of concerns. I'm not a studio lighting expert so I'll be interested to see what others say too.

First, they have much less power than a monolight - maybe enough for what you need them for, but at some point you might need something else - especially if you need a light with an umbrella or soft box, etc. Second, you'll have to get creative with how to control the light - standard reflectors, grids won't fit - but if you're creative you can probably accomplish what you need. And third, but probably not a big deal unless it's high-end work, color temperature can be different between these flashes and a monolight, so they won't all match. Should be pretty close though.