I expected to be very impressed with the GB-6900B/1ER and although the connectivity is clever, it didn't feel like a £160 watch to me. If anything, my GWX-8900 feels like a more expensive model and the constant buzzing (I get a lot of emails) started to annoy me. That is obviously not a fault of Casio, but it did make me think that maybe a connected watch will not be a good idea for everyone no matter how enticing the technology sounds. I just feel that the watch is a bit bland for a G-shock at this price.
My full review is here- Casio G-shock GB-6900B/1ER review