We've done it a couple of times in the past and always really liked it. Everyone I've read who posts on these boards and has done it enjoys it - even the husband's (there is a 'tea' selection for men). There are several choices of teas and foods.
Be sure to allow time. It's a slow, relaxing pace, as afternoon tea is suppose to be. Maybe 1 1/2 hours or more. I wouldn't want to wolf it down. Defeats the purpose.
Also, it's plenty of food. Make it in place of your lunch. Or if later in the day, don't have a big dinner planned.