My one and only bottle of Green Spot was a bit of a disappointment. It had very little of the fruit I love in Irish whiskey and too much of the "wax." My bottles of Redbreast have been much better.
Yes, Midleton is a blend. Way overpriced. They have released some older expressions in the last couple of years that have won praise. The only one of those I have tasted (thanks again, John) was a 26yo finished in port wood. IIRC, it was rather rich for an Irish with lots of mellow fruit flavors, enhanced, no doubt, by the port wood. Tasty.