Improved Scroll Casting was the entire reason I took this prestige class... I actually felt scroll blade and scroll shield were just silly, it just wasn't a flavor I found that interesting. On the one hand, it was completely worth it for that one ability. Improved Scroll Casting is that good.
On the other hand, I was more impressed with Scroll Blade and Scroll Shield than I thought I would be. So... even better.
Since I was playing the classic controller style wizard I had no interest in heading into melee. I primarily used defending with Scroll Blade. Combined with the AC from Scroll Shield,a regular casting of Mage Armor and a pretty high dex, I inadvertently had the highest AC in the group (it wasn't the highest of bars to reach, but still).
Anyway... did I mention how worth it Improved Scroll Casting is?
Apropos of nothing, but a wizard who gets scribe scroll feat can make scrolls for the same amount that he sells them for... so there is no reason to not have all non-liquid funds turned into scrolls. Once you have this ability as well you have access to a very effective array of spells at any time... far more spells than any other class.