Hello Mecha,
No, I haven't tested the others yet as I was told by Fonality that all three ATT Uverse routers I referenced are incompatible. However, it was suggested to me yesterday by an excellent Fonality IT rep to try this router
(specifically the N600) in conjunction with the ATT 2WIRE 3801 I already have and it should solve my problems. The link above is obviously from Amazon but apparently the router is also available from a Fonality directly. Once I order & receive the N600 I'll give a whirl and post the results.
Good luck.