when the mech screen is wrapped up, this'll be essentially the exact height of the pru -- whether it's ultimately three feet shorter or five feet taller or whether people nitpick about what point on either should be considered the pinnacle, meh... it's not going noticably taller (or shorter) than the pru and, at the end of the day, even if with the screen it's 20 feet taller than the pru (it won't be), that still doesn't challenge JHT, so -- a tall tower that still wouldn't stand out in any cities that really embrace height.
does it matter? the only way i think it does is that, while i've heard some (usually older) saying that it "ruins" the classic boston skyline with the (former) twin peaks, what bothers *me* a little is that those three are soooo close in height to one another that there's no motion to that portion of the skyline. having two towers of roughly equivalent height creates a symmetry and balance which works fine. having three creates a static dynamic. had 1 dalton gone noticably taller than JHT i think the overall effect would've been more aesthetically pleasing in context.
all that said i think 1 dalton looks neat and i'm psyched to have finally actually been alive for a truly tall-ish tower going up in boston.