Thanks, everyone, for your replies.
So, wireless is more convenient but that's about it.
My BlackBerry approach was to plug in and charge when I got up - 5.30am - always 100% by time I left for office an hour later. Then to plug in and charge again when I got home about 12 hours later. Rarely did the charge drop below 60%. I've always got either a USB cable and/or mains charger with me.
To go wireless here in the UK works out at about ?20 for the back and another ?50+ for the wireless pad so I think I will probably pass on that, unless I can come up with a compelling reason to lose the wires.