I got the brakes a week ago. I had used only Hayes mechanical, and Avid BB7 mechanical disc brakes before, so my thoughts will be quite limited, and will be based on the comparison of these brakes. Here is how it goes:
First I installed the calipers and levers. Before tightening them, I measured the length of the hoses and cut them to the length I needed. That was very easy, only a few minutes. Just, remove the hose from the levers, cut it, put new sleeve nuts and olives, and tighten it back. On the manual, it doesn't say that the system has to be bled after cutting the hoses, but I wanted to bleed the system just to make sure there are no air bubbles.
Bleeding was super easy. That was my first ever hydraulic brake bleeding, and I found it much easier than I thought it would be. It was even quicker than trying to align my old BB7 brakes.
After the bleeding was completed, I installed the new Hope 2-piece rotors, and then installed the wheels. Aligning the front caliper took only a few seconds, as it is the manitou post mount version. I squeezed the brake lever while tightening the caliper bolts, and it was perfectly centered. No drag or anything. The alignment of the rear caliper was a little harder. It comes with 0.2 mm spacers, and these have to be used in order to make it drag free. I used 2 spacers for each bolt, but I had to remove and reinstall the caliper 4 or 5 times before I found the best setup.
Yes! The installation is complete and let's go for a ride First, I went for a 75 km road ride, and by the end of the ride the brakes were already broken in. Next day, I went to a mountain where I do most of my training. 1.5 km long, and 150m elevation change, some straights to speed up to 50-60 km/h, and some sharp hairpin turns that can be taken at 10-15 km/h at most. So lots of braking power required. My Avid brakes used to overheat, and lose lots of power by the end of the decent, but Martas didn't have that power loss (Hope rotors may be helping here too). They were very strong all the way down, and they felt more powerful than the Avids.
OK, road test is complete, time to hit the trails . On the trail, these brakes rock. The feeling is awesome, and the modulation is better than the Avids. With Avids, I had to use 2 fingers in order to get the best control, because the more I squeezed the lever, the more power (from the fingers) it required. But with Martas, even with one finger I can get the most control with less input power (I hope I'm making sense here). So now, I can keep my fingers more relaxed, and concentrate more on the trail.
To conclude, it's been only a week but so far I think these brakes totally worth the money. They offer all the control that I would want from a brake system. I haven't seen any weaknesses except the installation of the rear caliper. But since it is a 'one time only' thing, it's not a big deal.
Here are some pictures:
Rear brake with uncut hose
Front brake with uncut hose