Achan hiArusa
Explorer
I don't know about high levels, I used them in a 7th level game. If the fighter has whirlwind attack or great cleave I would make sure there were at least 12 so he couldn't take them all down in the first round.
As for the increases in defenses, the standard 4e (+2 to saves and AC for elites and +5 to saves and AC for solos) works just fine.
Also, increasing the hit points of an elite by only 150% doesn't get the proper effect of a sustained combat against a boss. Again, when I playtested it the x5 actually worked out fine and resulted in a fun combat. Remember that 3e characters have a higher damage output than 4e characters so to get the same effect you need more hit points (but I think that x5 in 4e is a bit much, in 3e its just fine).
But I do like the categorized reactives and may steal them for my own use.
As for the increases in defenses, the standard 4e (+2 to saves and AC for elites and +5 to saves and AC for solos) works just fine.
Also, increasing the hit points of an elite by only 150% doesn't get the proper effect of a sustained combat against a boss. Again, when I playtested it the x5 actually worked out fine and resulted in a fun combat. Remember that 3e characters have a higher damage output than 4e characters so to get the same effect you need more hit points (but I think that x5 in 4e is a bit much, in 3e its just fine).
But I do like the categorized reactives and may steal them for my own use.