Used it on fast speed on tiled floor and very short compact carpet, sorry don't have wood floors so can't comment.
Reasons why I'm happy to replace with this one is:
The handle on the old style yes is extendable only I'm only 5 3 max and always use it at it's longest.
The odd time it has stuck, I couldn't get it to easily extend and the odd time it has slipped down in length, on it's own.
Also I noticed when the girl was doing the demo when it came to removing the handle she unclipped it from the short handle.
On the old one the long handle pulls out and sometimes I've not found that it doesn't come out too easy.
It sounds like I'm being very picky, I'm not but trying to explain how this may well solve things for me.
Ours has been hammered like nothing else, with an Andrex puppy jumping all over it like it's a toy.
I did think with the added lights on the new one they may drain the battery.
That said being £10 cheaper, one speed which I only use the fast speed, fixed length handle which I always use at full length plus looking an easier removal of the handle for stair cleaning, it does seem like it may well suit me better.
Also if it's of any use the old one doesn't have a hole to hang it on the back of a door, as I've checked mine, noticed on the video Dale said the new one does.
Hope that is of some help for those undecided which to go for.