As always, it depends how truthful the advertising is!!
Of course they may be hedging their bets to avoid "you said it would do 60 miles, it only does 40 I want my money back"... or not

Proof of the pudding will be in the riding. Apparently the (horribly expensive) Tesla manages to meet it's distance claims.
All that said, battery life is steadily improving and the design of electric and electronic devices even more so, remember the battery life of the first mobile phones....? My current one has been on constantly for as long as I can remember and it's at least a couple of days, umpteen texts and a couple of calls since it's last charge!
Anyway Steffan, you could treat it like the bikes of the old days, 60 miles riding then 4 hours maintaining the bu**er, except this time you don't have to get oily you could just have a cuppa

Joking aside though, how many people commute more than 40 miles? At 6p for a charge, ride to work, whang it on charge, ride home.... will work for some, what's the congestion charge in London now anyway? and when do the profiteers, erm sorry, politicians plan on inflicting it elsewhere?
Like I said somewhere near the beginning, it's a solution for the few just now, but imho I can see the potential there. (How many GXSRZZRXXXR's are ridden 20 or 30 miles at the weekend then parked up the rest of the week, and they cost even more to buy!

)
Edited to add: Just checked their website "Up to 60 miles" so I'd expect 40ish. PITA then, although you can buy a reserve battery to plug in which apparently will give you up to an extra 40 miles.
Not there yet, but getting ever closer.