Well... My friend got his replacement THR22 installed last week, and it works fine, no lockups.
I told him to call the install group and insure that they were bringing out a TiVo THR22.
The install group said that they didn't know anything about bringing out a THR, and was just bringing out a D* DVR, so lucky he called.
He had made it very clear with D* CSR that he needed a THR22, guess they don't have any way to specify which DVR to bring out.
So if anyone out there orders a THR22, and it is being brought out by one of the D* installers, be sure to call them to insure that they will bring the correct unit.
D* sends out a conformation letter with a phone number to call if you need to cancel the visit or change the date, so use that phone number.