Defense Bonus Variant: Does it Work?

[Ravens_cry]

Not wanting to take over another thread, I decided to start my own on the matter.
This one specifically.

As I said in the other thread, I am working on Stone Age campaign, and this seems to be a solution to the problem of armour in a world where hide is as good as it gets.
But has anyone had any experience with this system? How does it affect the game?
Is it actually workable?
I await your responses eagerly and with gratitude.

[Zeta Kai]

I can't vouch for the DBV, but I did run a mini-campaign set in a post-apocalyptic era in which the characters had not access to items, a sort of New Stone Age. The characters had to fight with sticks & stones, so they used variations on the standard BAB & save bonuses. Here's the chart that I used:

Optional BAB Progressions
{table=head]Weak (½HD)|Average (¾HD)|Strong (1HD)|Great (1¼HD)|Amazing (1½HD)|Perfect (1¾HD)|Sublime (2HD)
+0|+0|+1|+1|+1|+1|+2
+1|+1|+2|+2|+3|+3|+4
+1|+2|+3|+3|+4|+5|+6/+1
+2|+3|+4|+5|+6/+1|+7/+2|+8/+3
+2|+3|+5|+6/+1|+7/+2|+8/+3|+10/+5
+3|+4|+6/+1|+7/+2|+9/+4|+10/+5|+12/+7/+2
+3|+5|+7/+2|+8/+3|+10/+5|+12/+7/+2|+14/+9/+4
+4|+6/+1|+8/+3|+10/+5|+12/+7/+2|+14/+9/+4|+16/+11/+6/+1
+4|+6/+1|+9/+4|+11/+6/+1|+13/+8/+3|+15/+10/+5|+18/+13/+8/+3
+5|+7/+2|+10/+5|+12/+7/+2|+15/+10/+5|+17/+12/+7/+2|+20/+15/+10/+5
+5|+8/+3|+11/+6/+1|+13/+8/+3|+16/+11/+6/+1|+19/+14/+9/+4|+22/+17/+12/+7
+6/+1|+9/+4|+12/+7/+2|+15/+10/+5|+18/+13/+8/+3|+21/+16/+11/+6|+24/+19/+14/+9
+6/+1|+9/+4|+13/+8/+3|+16/+11/+6/+1|+19/+14/+9/+4|+22/+17/+12/+7|+26/+21/+16/+11
+7/+2|+10/+5|+14/+9/+4|+17/+12/+7/+2|+21/+16/+11/+6|+24/+19/+14/+9|+28/+23/+18/+13
+7/+2|+11/+6/+1|+15/+10/+5|+18/+13/+8/+3|+22/+17/+12/+7|+26/+21/+16/+11|+30/+25/+20/+15
+8/+3|+12/+7/+2|+16/+11/+6/+1|+20/+15/+10/+5|+24/+19/+14/+9|+28/+23/+18/+13|+32/+27/+22/+17
+8/+3|+12/+7/+2|+17/+12/+7/+2|+21/+16/+11/+6|+25/+20/+15/+10|+29/+24/+19/+14|+34/+29/+24/+19
+9/+4|+13/+8/+3|+18/+13/+8/+3|+22/+17/+12/+7|+27/+22/+17/+12|+31/+26/+21/+16|+36/+31/+26/+21
+9/+4|+14/+9/+4|+19/+14/+9/+4|+23/+18/+13/+8|+28/+23/+18/+13|+33/+28/+23/+18|+38/+33/+28/+23
+10/+5|+15/+10/+5|+20/+15/+10/+5|+25/+20/+15/+10|+30/+25/+20/+15|+35/+30/+25/+20|+40/+35/+30/+25[/table]

Optional Save Progressions
{table=head]Poor (⅓HD+0)|Average (0.4HD+1)|Good (½HD+2)|Great (⅔HD+3)|Amazing (¾HD+4)|Perfect (HD+5)
+0|+1|+2|+3|+4|+6
+0|+1|+3|+4|+5|+7
+1|+2|+3|+5|+6|+8
+1|+2|+4|+5|+7|+9
+1|+3|+4|+6|+7|+10
+2|+3|+5|+7|+8|+11
+2|+3|+5|+7|+9|+12
+2|+4|+6|+8|+10|+13
+3|+4|+6|+9|+10|+14
+3|+5|+7|+9|+11|+15
+3|+5|+7|+10|+12|+16
+4|+6|+8|+11|+13|+17
+4|+6|+8|+11|+13|+18
+4|+6|+9|+12|+14|+19
+5|+7|+9|+13|+15|+20
+5|+7|+10|+13|+16|+21
+5|+8|+10|+14|+16|+22
+6|+8|+11|+15|+17|+23
+6|+9|+11|+15|+18|+24
+6|+9|+12|+16|+19|+25[/table]

IIRC, the classes were adjusted like so, to allow for more variation between classes:
{table=head]Class|BAB|Fort|Ref|Will
Barbarian|Sublime|Perfect|Great|Average
Bard|Great|Good|Amazing|Great
Cleric|Strong|Average|Average|Amazing
Druid|Strong|Good|Good|Great
Fighter|Perfect|Amazing|Good|Poor
Monk|Amazing|Great|Amazing|Perfect
Paladin|Amazing|Great|Average|Good
Rogue|Great|Good|Perfect|Average
Sorcerer|Average|Average|Average|Amazing
Wizard|Weak|Poor|Poor|Perfect[/table]

I hope that this helps.

[Ravens_cry]

Wow, thanks! I'll certainly have to look that over.