I've used them a good few times for wheels and tyres after seeing decent reviews on forums like this. I like the fact they do specific pricing for tyres and wheels etc not the usual "what are the dimensions/weight?" that most couriers use. Never has any issues and they usually arrived the next day, even though I only paid for 3-4 day etc. Insurance wise I think they recently revised their costs etc. IIRC the first £50 is covered FOC and the upgrades above this are cheaper than they used to be. For me it depends what I'm sending anything up to £100 or so I'll risk it, beyond that and especially if its tyres I've sold on ebay etc I'll insure it.