We have been quite happy with our Honda Euro; it's quick, comfortable and fun to drive. Early last year it developed a bit of a shudder sometimes, at low revs. This seemed to correspond with using ethanol blend fuel (so don't listen to the recommendation for this on the Honda site!). We were a bit worried about damage to the engine. It was due a service soon anyway so we took it in and asked to have a major service done, particularly the valve clearances.
When we got the car back, the shudder continued. It was intermittent so it was hard to diagnose. We concluded that it must have been the fuel, so we ran a couple of bottles of injector cleaner through the engine over a couple of months. Still, the shudder continued to reappear from time to time.
We were getting to the point where we thought we would trade it in, but thought we'd give it one more service. Our original dealer - Eastwood Honda - had gone out of business so we took it to Parramatta. Another major service - and this time, it came back running beautifully. The service guy told us that the valve clearances had been off and had required adjustment. So - my only conclusion is that the prior service at Eastwood was not done at all, or at least the important bit which we specifically asked for - checking the valve clearances. This is really frustrating as we specifically requested it and the paperwork specifically says it was done. You can't trust these guys!
On reflection, this is not a one-off problem. In the last five services we have had done (different organisations - Honda, Suzuki motorbike, Toyota, Bayliner boat), four have had something wrong. The Landcruiser came back with 370kPa in the tyres not 220kPa - now that's blowout / accident territory. The motorbike came back leaking oil from the valve cover as there was an o-ring missing... the conclusion is that you think you're paying for professionals but you can't trust that they've done the job - you have to check it all afterwards anyway. Might as well do it yourself.