best wishes with your purchase Rob
never looked through a Delos they sound great though , I bumped a 13mm t6 for a 14 mm xw because I felt the 14 gave a better view, aside the FC issues you might come across in regard to this eyepiece in a fast scope (12" f5 for me ) I still found it optically a great eyepiece .
But have now replaced it with an ethos 13, your right the field stop is hard to see, and that imo is where if your going to warm to 100* fields is what you have to let go , in that don't look for it .