We have one of these in the house which I "recycyled" from my office - if you want to buy one I think you can pick them up easily enough for about £15.
This is a totally no frills phone - there is nothing particularly technological about it, so if you want fancy features and gadgetry, this isn't the phone for you!
The 1100 is very easy to use - there is the traditional 10 numerical buttons, with the star and hash either side on the bottom. Down the left hand side of the numbers there are 3 buttons where you can programme in 3 numbers of your choice and the phone will sotre them and speed dial the numbers when pressed - a convenient time saving function if time is of the essence to you!
On the right hand side there are 3 further buttons; 1 for recall, 1 for secrecy and 1 for redial. This is all a phone really needs in my opinion.
There is 1 further button for connecting a headset to the phone, but this is not something I have ever done. There is also a red flashing light on top of the phone for when it rings. There are further controls to alter the volume and pitch of the ring.
The sound quality is good - I have never had any problems with it.
Overall, available cheaply and very no frills, which makes it easy to use.