Turbo Pascal was among the first languages/systems I ever coded in. Stunningly fast and capable in an age where Microsoft didn't have a clue, Borland went on from this to produce the Turbo Pascal for Mac (apparently now written out of Mac history - most people don't even know it existed, left Apple in its dust) which was similarly blindingly fast, Pascal for Windows (first Windows system I ever coded on, far better than the Microsoft offerings) and finally Delphi which wiped the floor of anything Microsoft produced on Windows for a decade - Visual Basic was truly pathetic in comparison.
But somewhere around Delphi 2 or 3 Borland started to loose its way. Sure it continued to be good up until Delphi 7 despite Microsoft progressively catching up, but then came the 'we don't want to be a software development company' fiasco of 'look we're Inprise, or look we're Borland again, oh look we want to sell **anything** but the best thing we ever produced'.
True Embarcadero do seem to have rescued Delphi somewhat, and it will probably have some sort of ongoing future, But back in he day Borland nearly owned the development space, and it though it away because it took it's eye off the ball and its vision faltered. Simply a tragedy.