I've only been on a couple of Delphia's and that was maybe five years ago. The quality of the fitout was terribly disappointing. From the pics of the D28 though it appears they are very much improved. Nice little boat, as is the First. What fabulous things for daysailing (quick and easy to get under way, fun to sail) with the ability to overnight or weekend. Good stuff.
I have to say I am in agreement with Fast re the TES. Quality looks great , no doubt but they are not a pretty boat yet they could be if not for the obsession to sleep so many people.
Would any of you choose to sleep four on a 30'er ? On an overnight passage perhaps but not at anchor surely.
"Do you think God gets stoned? I think so... Look at the platypus." Robin Williams.