Tube Pre/ Class D Amp - Who has done it?

Open forum for those who have actually tried this.  Really curious to know who has been happy, or maybe unhappy, with a tube preamp driving a Class D amplifier?

Of course, tube pre with a solid state amp is a classic pairing for hard to drive speakers, especially ESL's.   This is a little different.   I'm really curious to know what pres and Class D amps have had great synergy.