RE: DLE Long term reliability ?
They seem to be quite good engines, The only thing I don't like about them is the piston ring, although not uncommon, I don't like piston rings that have lots of tension against the cylinder wall.
I have seen this type of setup quite a bit, especially with a chromed cylinder wall. IMHO a ring that is taller and has less tension and is properly sized is better.....but also more expensive.
But I wouldn't hesitate to buy another one.