you'll block a lot of attacks when you tele to andariel, and def when you tele into her room to snipe her with all of those mobs up on hell.
max block is well worth it in my opinion for an MF sorc.
also I had forgotten about the reskill/stat ability in the latest patch so technically you could dump your shit into whatever you wanted to level up and then just put your real stats in with a reset.
also if you make a d2jsp account magina I'll toss you some forum gold. I don't have much but it should be enough to get your some basics.
It is indeed very well worth it.
The problem is having a Spirit Monarch and max dex requires a shitload of stats to burn and that hurts the life meter a lot.