I'm a big fan of the series and this is definitely the coolest sonic screwdriver I've ever seen. The cool green lights, the variety of sounds, the cool robotic retro feel and the extending end make this a really cool device.
There are 3 buttons on the 11th Doctor's Sonic Screwdriver. The top 2 buttons in the middle of the device are the extender button and the sonic noise button
Unlike the previous screwdriver you have 4 different sounds to choose from by pressing the noise button in succession!
Sound 1 and 2 are the same sonic-like noise the previous screwdriver did except one is higher pitched than the other. You press the button once and they change alternately so it goes Sound 1, Sound 2, Sound 1, Sound 2 etc.
Sound 3 is a weird cool laser-like noise from pressing the button 3 times in quick succession. Sound 4 is the lower pitched noise of Sounds 1/2 except it flickers visually and audibly as if the screwdriver has an interference or running low on power.
However its definitely not perfect. Putting in the batteries is a bit of an ordeal and the screws involved in doing so were quite difficult to remove especially if you used the wrong kind of screwdriver which can strip the screw head and make it hard to remove the battery cover. The main button which activates the noises only works when the screwdriver is in its low position and so when extended, the button is attached to the point that is extended and moves into a small gap that is designed for you not to be able to press it in. Its hard to fully explain but it is a big annoyance.
The problem is somewhat solved by having a button on the bottom of the screwdriver under a hatch which is significantly harder to press than the other buttons and works whether the device is in the basic or extended position. It is pretty cool but it seems unnecessary when the problem could have been solved anyway. Also when the device is extended there is no button to bring it down so it has to be done manually. This isn't a giant problem but you can't seem to do it with your palm directly as that doesn't lock in the metal claws which means when you let go it just springs back up again. The only way to do it is to make sure your hand is only touching the light and push it down.
These all are minor complaints but overall the product is great. I'm not fan of collecting but if you're into collecting and displaying doctor who merchandise then the packaging for series 5 is pretty sweet.
If you're a fan and want to re-create some of your favourite moments from the new series or just have a wave around pretending to be the doctor, I can highly recommend this.