It's a big national company that runs ford fleet. they want them done around the 50-60 thousand mile mark. No visual degradation or particles that i could see. Ford recommend 150,000 miles but they keep changing it, I think it might be down to 100,000 kms now.
Its about a 6 to 8 hour job. easy job , just time consuming, lots to take off , and the sealant needed to seal up the sump and front cover, can get messy.
Cost wise I don't know, I just get to do the job.