Runtime is relative, it will be very different from one user to the next. I can tell you that 5800 mah gives longer run times then 5000 mah. But I guess you probably new that.
As for updates, I'm building a Brushless LST XXL because the Revo is a cool truck but it's a bit fragile for my taste. I fell out of love with ERBE. Don't get me wrong, it's got great attributes. Never had a problem with the tranny or the receiver box
As a matter of fact, I'm going to use the ERBE tranny and receiver box in my LST build.
Waiting for someone to reply that they've been running the ERBE for more than a year, 14 hours a day, 7 days a week on 6S and never broke anything.