On my EVT there is only 3 bleeders to replace, so price is not that bad.
When I changed my MC I had to bleed the system. I asked questions and followed the advice here. One tip was to remove the rear caliper, insert a block of wood between the pads and invert it so the bleeder was on top.
Everything went well until I bled the rear caliper and then had no front brake. Rebled the front then lost the rear. Fought with this for a bit. I did finally manage to get the lines bled by bleeding the rear and then the front. Once I figured that it needed to be done this way it was fairly easy.
At least on my 2004 EVT, in the hard line from the junction block to the front wheel is a valve that will keep the fluid from going to the front until there is a certain amount of pressure, then the fluid will flow. The valve is designed to allow the fluid to return back to the MC without pressure.
I do not understand how air was getting in the front line as I bled the rear, but it was. Yes I even closed the front speed bleeder to make sure it wasn't leaking, didn't matter tight, or loose ready to work.
When I need to bleed the brakes, I will use the speed bleeders again since they are installed. IF they fight me again, even though I think I know the trick, I will switch back to the originals and use the syringe.
I do have the speed bleeders on my HD. They sure make changing the fluid on it soooo much easier!