Yes ... I know it's a total pain in the rear end to put them together on an order by order basis, but it seems that the upgrade kits (as they're currently constructed) leaves some wasted parts or doesn't have enough to cover what players may have, possibly forcing them to buy multiple copies of each just to convert everything.
What do you think of the option to do A La Carte upgrading? It would probably, pound for pound, be a little more expensive than the upgrade kits, but at least you'd get exactly what you need for what you have invested into the game over the years. It is true that the game has gotten a bit stale and needed to be fixed in a few areas so a 2nd Edition isn't a bad thing ... just expensive, and possibly uber-expensive depending on how much you've invested.