Why do you hate it? Just curious as BG is making drills with on frame tanks for the hills of the PNW and I was considering one of them to replace our Cross Slot in a couple years.
My experience is based upon the drill itself and lack of a good dealer. The drill does a good job, but is a pain to work on and operate in my opinion. I was agonizing on how to fix my surging meters, my openers that would drop down on the road even when the safety lock was engaged, and my section control manifold that wouldn't stay in place. The first 2 issues have been "fixed" in the Bourgault world for 3 years, but I only heard about it last May even though I asked the dealer about it repeatedly. On the 3rd issue all I got from the rep was a "well, that shouldn't happen"... no help, no give a ****...
On to the drill. I think the seed opener works fine with the latest scraper update. It places the seed consistently at the bottom of the trench. I had issues with the old scraper, but it works a lot better now. I seed into a lot of tall residue like sunflowers, corn, stripper wheat and flax straw. What happens is that the long straw wears the grease zerks and loosens the hydraulic lines that attach to each openers cylinder which inturn makes a mess and requires the operator (me) to climb up and down the frame quite often. If you seed into residue that can jam or wrap around the opener Bourgault offers a shield that wraps around the front of the disc hub. The shield does its job, but it makes greasing, changing discs, and even adjusting the scraper position more challenging.
On to the MRB's. The Mid rows are attached to the frame and cannot follow the contours of the ground that well. Leveling the Frame is a matter of adjusting air pressure on the front tires on the toolbar. Once you get it dialed in it you can usually adjust all of the MRB's with the same depth shims, but to run 2" deep some MRBS have 2.5 inches of shims and some have .5 inches of shims. If you have any perfectionist or OCD bone in your body it will drive you insane. That first day you use them every year takes a few months off of your life. I have the closing tine instead of a guage/packer wheel. It does work better than I thought it would.
On to the tank. (7950). Most everybody loves the Bourgault cart and I can see why. There are a lot of good things about the cart... I really only have 2 issues. First, I have 8 primary lines for fert and 8 for seed. With my blockage monitor it can show a flow rate and compare tower to tower. Some towers are going to be up to 8-10 percent hot and some are going to be 8-10 percent light. There isn't a way to fine tune the air flow system like there is on some other brands. Does it really matter? I would say probably not a whole lot, but you can occasionally see some streaking if you pay attention. The other issue that I have which may be a tractor issue instead of cart, but the fan RPMs really change as the hydraulic oil warms up. As an example it could be 4200 RPM starting out but 4800 rpm when it warms up. For most people that may not matter, but I try to use as little air as possible so seed or fertilizer doesn't "bounce" out of the trench. If the operator isn't paying attention this is the difference between running smoothly and plugging a few runs.
Because of all my little complaints I find it to be a highly stressful drill to run and it unrealistic to put any john smith in the tractor for a weekend to run this. However, the crops that come up behind this are usually really good. Hopefully that answers your question.