@ tmcd35
If you are thinking of deploying a few devices and your teachers or IT staff are willing to re-image, reset to factory condition annually and install apps on them or oversee your students do it, then Windows laptops or iPads are fine. However if you are deploying 20 or more, then Windows or iPads become a problem in terms of maintenance overhead and app installation, and the cost and time burden it places on teachers and school IT staff. Chromebooks are Zero Maintenance, Zero Touch devices (means that IT staff never need to touch, log into, configure, install apps on or re-image a Chromebook), and they don't even need a local Windows authentication server or mail server to be set up to provide domain email and domain authentication and access control.
Basically what I am saying is that if you are happy to maintain them, or spend school time with your students doing it, then Windows laptops and iPads are fine. If not, you are better off with Chromebooks.
Deploying Windows (or Mac) laptops in 1:1 deployments for schools in the US has proven to be impractical in the US due to the difficulty in finding sufficient IT staff to support them and the high salary cost of the IT staff required to support them. This is why the 1:1 deployments have gone with Chromebooks.
I would stay clear of Windows netbooks and budget Windows laptops. They are slow, and have poor build quality, and have poor battery life - fine for cash strapped consumers who are only worried about the sticker price, but they will cost schools more in the long run through breakages and poor student/teacher productivity. That's why businesses won't touch them. Basically hardware is dirt cheap, but IT or teaching labour isn't. By buying Windows netbooks or budget Wundows laptops, you are saving pennies on hardware cost to throw away pounds on maintenance and support costs. In the US, schools that deployed Chromebooks to replace Windows PCs/laptops found the Total Cost of Ownership of Chromebooks to be about 30% of that of Windows laptops/desktops.
If you want keyboards that are destroyable by students, then consider Chromeboxes with a cheap USB keyboard and mouse. Of course Chromebooks can be switched out and replaced with zero effort if they get broken. All you need is to get a new one by post and have your student log into it - all his/her data, settings, apps will be right there on logging in.
Internet connection is important for Chromebooks. However the reality is that in most places broadband Internet connection is more reliable than electricity mains supply. You can for example also set up Internet access to be shared between two ISPs one using ADSL and the other using a cable modem to increase Internet availability further as some businesses do when Internet is critical - although this is rarely necessary for a school. However you do need to get expert advice on Internet connectivity and wireless access point deployment in school if you are talking about a large scale deployment. You should speak to Google Education
Benefits ? Google Apps for Education and ask for advice on this. I presume they will put you through to a reseller who would be able to advise on this.