When I arrived at Electriphy, I had a very small ASIC team and had inherited a CPU core that had more than 40 known bugs and numerous other problems. We were already well into Firmware development so purchasing a new core was not a viable option. Sibiz was able to come in and help us assess the problems with our CPU, and workout a plan of action and a schedule to fix our CPU core. We had a small office with limited space and compute resources so Sibiz did most of the work in their own facilities. I found the Sibiz personnel to be very competent and easy to work with. They worked with us to find the best solutions to problems and greatly improved the quality of our design.
In the end they met their proposed target schedule date, in addition to meeting performance and areas goals. Overall Sibiz did a great job and I would highly recommend them for any ASIC design or verification needs.