I work on the UK railways and usually take the train everywhere but took the coach for the cost (£20 round trip as opposed to £60 for cheapest train fare). Have to confess I was dreading the journey!
What a surprise! Nice new bus station at Manchester and Birmingham. Coach on time (to the minute!). Not busy, had two seats to myself on a Friday and Sunday when trains would be packed out, and leather seats and on board toilet.
Yeah it's not as quick as the train, but for price it can't be beaten and the comfy leather seats are great. I've changed my opinions of UK coach travel, just now need to convince my friends!