We've used them for 3 years.
Good Points:
1) Parcels left at post office if customer not in (mostly!)
2) Cheap compared with others for UK deliveries
3) Later collections than others (in our area at least)
Bad Points:
1) Absolutely ZERO customer service, not once have I had a call returned or email answered. (They do not have
post sales account management for sub £1m accounts, only pre sales.)
2) Not interested in smaller companies (less than 3-400 parcels per day)
3) Un-responsive to complaints
4) On average have a drop & run approach to in-transit damage (to be fair, we have less than 1% damage, but without fail the customer claims to have been told to sign for acceptance, invalidating any later damage claims)
5) Dispite having a 30 day account we still need to make a 30 mile round trip and pay by cheque for imports with VAT due.
For exports other companies blow them out of the water for price and speed of delivery.
Overall, if I could find another courier with a late (3pm or later) pickup, and who came within £1-£2 of PF per unit, I would use them. However, customers love the Post office pick-up (If the driver chooses to use it!) Obviously service will vary depot by depot, we are in a rural area, so have to accept what little we get

but the lack of a named contact bothers me.