Teacher professional development insight?

I am getting ready to plan summer professional development for teachers and I want to provide a new way for them to not only learn new technology but interact with other teachers to discuss using the tools. I would like other teachers to post their opinions of what I am suggestion. Any insight is great insight!

I would like to provide 2 hour blocks of training to small discussion groups of 8–10 teachers. The first hour is seeing and learning the tech tool. The second hour combines group discussion of using the tools in the classroom and then each individual developing a lesson using the tool.

Do you think teachers will enjoy this type of approach? Do you think they may walk away with something more than just a regular PD day? Is 2 hours enough time or should it go to three? I don’t want to pack too much into it but will adapt for different groups and perspectives.