I agree with Altemose - I'm actually quite happy with my AEs, especially the AC version. I own enough DAS that I felt I didn't need a Time Capsule. My qualms are with my SB6141, not with my AE that's attached to it (used to be a 4th Gen, now an AC unit.
Just a note, the SB6141 seems to be sensitive to power levels and noise, and with Comcast some markets have been reporting more problems than others. I've been working via IM on the DSL Reports forums and only just yesterday ironed out some kinks in my service connection - so much easier than dealing with CS over the phone.
If you do opt for an AE or TC, follow the set up instructions. I imported a configuration setting file from the 4th Gen into the new AC, and it didn't go so well - a first for me, but the AE is a new animal, and a non-issue for you. After restoring the AE and turning off the modem, I plugged in the modem and waited until it was up and running, then connected and plugged in the AE - the AE configured itself automatically. Nice. My first SB6141 died, the second one has been a PITA - until yesterday. Now that I've jinxed it...
Get the AE or TC - you'll wonder why you didn't do it sooner. My IT guy likes to tinker with electronics - and he has two AC AEs at home...