Updated Spells Known Table--what do you think

[ShriekingDrake]

One of our players has proposed that we change the spells known progression to the following. I like the logic of the table, and it looks like it makes 0-9 spontaneous casters a bit more fun. I am wondering what you all think about this progression. Are there problems with it? Are there pit falls I'm overlooking? I'm inclined to allow this--updating my monsters as well--but want to be sure I'm not falling into a trap.

SPELLS KNOWN

01st 5 2
02th 6 3
03th 7 3 2
04th 8 4 3
05th 9 5 3 2
06th 9 5 4 3
07th 9 6 5 3 2
08th 9 6 5 4 3
09th 9 6 6 5 3 2
10th 9 6 6 5 4 3
11th 9 6 6 6 5 3 2
12th 9 6 6 6 5 4 3
13th 9 6 6 6 6 5 3 2
14th 9 6 6 6 6 5 4 3
15th 9 6 6 6 6 6 5 3 2
16th 9 6 6 6 6 6 5 4 3
17th 9 6 6 6 6 6 6 5 3 2
18th 9 6 6 6 6 6 6 5 4 3
19th 9 6 6 6 6 6 6 6 5 3
20th 9 6 6 6 6 6 6 6 5 4

[ShriekingDrake]

I do know that this is not the most exciting subject. But I'd really welcome thoughts. This looks fine to me, but I want to be able to justify my ascent or denial either way.

Right now, I'm inclined to allow it for all spontaneous casters who go to 9th level spells. But, I am prone to overlooking the obvious and would appreciate the wisdom of the boards.

[Answerer]

I think it's fine in any game that allows Tier 1 prepared casters. Those would still be better than this, but this gives the spontaneous casters an actual advantage in some respects, as opposed to being almost-strictly inferior.