Is this a good bit...

Yes shorter shanks make a bit more mild (the shorter the shanks and longer the purchase the gentler the bit), but the angle of the shanks do too, one with the shanks gently curved toward the rider are the mildest (IMO). Curved away from the rider increases the pressure of the bit. The main awful thing about this bit is the high port, that will hit most horse's pallets and be very severe.

Yeah the port is 2"

Does anyone know of a bit like this that is more mild?

Hopefully this link works. Similar, but milder.

http://www.tackranch.com/255802.jpg
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FES Bit Western Jointed Port/Roller Mouth in Mullen/Low Port at Schneider Saddlery how would you guts rate this bit? I bought it for my gelding who hates snaffles but I haven't used it yet. OP, I believe this is a good mild curb but I don't know a lot about western bits
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That's like the bit I use now- but I want a correction bit.

What are you wanting to correct?

I don't want to correct anything- my horse reponds well to pressure and I want to make him even more responsive (respond quicker)

Oh. Then it sure wouldn't hurt to try. Let us know how it works for you and your horse.