I've used the T60 and L90 (installed base of 6, about 10 service years) and am still having problems with one T60, it crashes and has to be hard rebooted before recovering. (Still working on that problem) The programming software has improved a lot since first issue. The relays are very "feature rich" (kind interpretation) so programming and setting the relay to flex it into your vision is a task requiring some serious dedication, time, and playing. (I've also lost a card on another relay, but it has been doing fine since replacement)
We have a client with a couple of D60s in service. Also have T60 in service with another client. The D60 has been in service about a year and is working OK as far as I know.
T60 has been doing fine.
I agree with Gordon that programming is not a trivial matter. It is completely unlike the older Multilin relays. As delivered, the relay does NOTHING. You have to program all of the trip outputs.
You also have to make sure to order the correct modules when purchasing.
