As you say - the stats are vital to speed problem diagnosis.
100% agree there. A modem that you couldn't get information from was perhaps acceptable back in 2000, but its a joke now - and with experience of self-install ADSL, BT ought to know that.
I collect my DSL stats in a program (OK, web-app) called "cacti", which holds the data in RRDtool datafiles, and helps you make graphs of the data. RRD means it stores lots of data for the last 2 days, middling for last two months, and small amounts for the last 2 years.
It's going to be a shame to lose this as I swap to fibre. Anyone got any ideas how to automate the BT speed tester? That way I can at least grab BT's copy of the IP profile.