I will be plumbing my new kitchen soon and I am sold on thePex system except for the cost of the Pex clamping tool. I was wondering if I could use stainless steel worm drive clamps instead? I'm already using them on several connections already around the pressure tank etc. Thanks in advance...

I'm not a plumber but I wouldn't consider stainless hose clamps? To be sufficient. Have you seen toolless push-fit fittings (http://www.pexsupply.com/SharkBite-Push-Fit-Fittings-588000)?

Scleros, Actually I have used Shark Bites before several times, they are awesome. But expensive. I just wanted another alternative instead of having to sock that much money into a few joints.

You could give the hose clamps a try under the sink with a bucket underneath, but for in-wall connections, not worth the risk IMO.

S.S.Clamps will cut into the plastic PEX line. I would not use anything else but what ever the manufacturer suggests. The tool itself is not that expensive. You can buy it, do the job, and resell it on eBay.

Use the right clamp.

Sooner or later you'll have a leak and your insurance company will see the clamps, ask to see the permit for the plumbing, and then deny your claim.

Or, you'll try to sell the house in a few years and a home inspection will reveal the clamps. You'll then have to fix it correctly or lose a sale. Meanwhile the prospective buyer will be trying to figure out what else you've cut corners on.

Not trying to be a jerk, just realistic.