Hi Chris,
No manufacturer can guarantee 100% reliability, that's why they give a warranty in addition to your statutory rights.
Where manufactures differ is how they administer their warranty and how good, bad or indifferent their aftersales service is.
When I purchased my new van last year I had a powrtouch mover fitted, I based my choice on the feed back from others on how good powrtouch were if anything did go wrong.
Well sods law went into overdrive! During a visit to Wales on the August bank holiday weekend the right hand motor failed, at 4.55 on a Friday afternoon I telephoned powrtouch, they took my mobile phone number and said they'd phone me back, an engineer from their technical department phoned me back almost immediately and talked me through some checks that I could carry out myself whilst he was on the phone, we could not solve the problem.
I was phoned the following morning at 9 o'clock they were very apologetic they told me that they could not locate a local engineer to come out to me to fix the problem, I said that that would not cause me any problems for that weekend, but the following Friday I was off on my annual hols to the south of France. No problem, we'll get an engineer out to you Tuesday to fix it, I said that there would be no one home as we both work, no problem we'll get an engineer out in the evening.
Needless to say the engineer turned up on the Tuesday evening and replaced the defective motor within an hour.
Now that's what I call customer service! & I'm glad that I chose powrtouch.
Motor mover? The best bit of kit that I've ever bought, why the hell I didn't do it years ago I don't know, but would never be without one now!