I have just got a card machine from my bank - Barclays, via Barclaycard Merchant Services. They do a special rate if you are with The Guild.
Mine has a charging terminal in my home by the phone & I take the mobile unit out into the salon (garden log cabin).
Most of my clients think it's a godsend for them as they don't normally carry cash & have to make a special journey to the cash point just for me- lets face it, it feels like you are spending money when you have to physically get real notes out and hand them over, but with a card machine, it's easy just to hand the card over. A painless transaction lol!
It's only been in operation about 10 days, so I've not had a chance to gage it's worth, but I'm not having to allocate 1/2 a day to got into town (10 miles) find a parking space at £1.50 a pop and pay extra to pay cheques into my account. So for me, it's time saving and the charges for having it are worth it.