The explosions of series 1 in particular (The Oberth class ship and the klingon ship from their episodes) are so much better than the bizarre puff-ball effect they originally were
(Even worse, they're the same explosion from the Oberth class ship in The Search For Spock copied and pasted over.
What, you only have ONE explosion effect in the archives? Jaysus....
And don't forget that very explosion was used for the destruction of the Enterprise D's star drive section in Generations. For all the times that explosion has been used throughout Star Trek's history, I'm surprised they haven't used it at least once in the restoration. It's a fairly nice looking explosion in my opinion.