Significant cost savings at $1000 for the DF. Half of OEM list price actually which is about $2k with no 25% discount. $500 here and there adds up to significant savings if you are doing the conversion as you can save thousands on something that would otherwise cost like $10k. And the oem prices are only climbing with demand as parts become more rare and discontinued!
I am on the fence about which bumper to get also. The rest of my car will be all DF conversion so I am thinking to stay with the theme. If I had all oem parts I would probably spring for the oem bumper. The DF one eliminates the tow hook cover which is notorious for popping off so that's a plus. It's also one piece so that makes it easier to install but you can't replace just the bottom if you crack it. Repairs are probably easier on it than the oem. Plus my car is black so you can't tell the one piece from 2 piece very easily like you can on colored cars (especially light colors).