Reliability of Dan D'Agostino equipment

I'm considering a purchase of one of the D'Agostino preamps, and eventually, an amplifier.  I have learned from hard experience that high end brands, that should be bulletproof and reliable, and often anything but.  

What is the experience of folks on the forum with regards to D'Agostino?  

How often have you encountered problems?  

Have the problems occurred within the three year warranty or out of warranty?  

How long do repairs take, since if you place an order for a new item, the delay is three to six months for shipping?

Many thanks in advance for any responses.