Cheers pal, I'll go over to Specialized and have laugh, hope to be an active member on here rather just come on if I have a problem..This forum is full of doom and gloom stories about moto failures, half the reason people become members is when they have an issue. Just go into the Specilized section if you want misery and despair!
In the real world amongst people I ride with regularly, I am the only one I know who has had a Shimano motor failure, whereas all my mates with Specialised have had multiple motor or stymie problems.
I would say the Shimano is probably the most reliable of all the sytems, but like anything you are going to get issues with some units. The good news is the Warranty with them thought Madison, the UK distributor, is well run, and accessible via most LBS's.
Plenty of tips on here on good ways to protect the motor, remember whatever you do dont jet wash it, and be sensible with your maintenance.