I have 5 nights booked at the D Cube prior to my son's wedding early next month. We then have 7 nights elsewhere, before our last night at the Sheraton Incheon before we return to the UK.
There is a family party of nine traveling, I have chosen the hotels based on reviews and first hand experience from my son. First time we have stayed at SPG properties so it will be interesting to compare with Hilton/Marriott Brands.
Finally I have been very impressed with both hotels regarding their responses to my emails. If that's a sign of their customer service they are off to a good start.