That's the nice thing about the Fritz! simultaneous dual band...for if I ever need it 
Had no problem with DLM here I'm about 350 mtrs from the Cab and get 79992/20000, it's been the same since I got the Router and I have never had to reboot it due to problems
Yes some people have no issue, others can report that using the ECI modem on a Huawei DSLAM has caused jitter and interleave to be set, and going back to the ECI has removed the interleave.
You're lucky to get top speeds - some of us have 500m lines and only 45meg :-/
James BT Infinity 2 19/09/2012 - Estimate 44.6/6.5 - Install 52/12 - Actual 46 / 8 Mbps
Huawei VDSL -> Draytek router -> Apple Airport Extreme -> Belkin Switch -> Windows/Mac/Linux/NAS/Phone
13 years of broadband - 1999 ntl:(512k/1M)/BTbusiness(2M)/Metronet(2M)/Bulldog(8M/16M)/BE(19M/16M)/BT FTTC(46M)