On Thu, 2 Mar 2017 04:09:45 -0800 (PST), wrote:

1. different temps at different predictable times are not wanted

Works for us.

2200 0700 15 C
optimum start target 18.5 @ 0700 runs through to 1600 with a same
temp event at 1200.
1600 2200 20 C

2. smart stats are a usability problem, resulting in poorer energy use
IRL

Even SWMBO'd can operate the stat. Just push the up button a couple
of times. This overides that time periods tem setting and is the
reason for the same temp event at miday, it cancels any overide set
in the morning. The lower night and day temps save energy, it very
rare for there to a call for heat overnight but there would be with
the temp stuck at 20 C.

3. They have relatively poor reliability.

Not a problem here, one is 5 years old, the other over 10. Wireless
as well. Danfoss TP75 RF.

Went back to a bimetal stat, gratefully.

No chance. B-)

--
Cheers
Dave.