I've bought lots of accessories there in the past few months, an off-white rope belt that is meant to go around the waist but I wear it around my hips, a leather corset belt,and a long, oversized, beige, worn-out thin jumper from the knits section to wear over skinnies. I never buy anything that isn't classic enough/too trendy from there, I find myself hating it after a while.
I think the problem with Topshop is is that it's all fine until you walk down oxford street and then find yourself running away from a girl who has the identical outfit to you. You want to go home and change. So it's all about the way you put stuff together. I don't think it's ever a good idea to do a head to toe Topshop outfit, even on a bad day when you can't be bothered. I remember reading an intervew with Simon Cowell when he said the second series of Pop Idol was so hard because all the girls were the same, so he started calling them "Topshop Idols". It made me laugh at the time, because it's very true.