These guys will do a proper job and do it right but they are cost to much for allot of services. Most plumbers will do the same level of work but charge less from my experience for most things . change a washer or fix a leaking loo shouldn't cost more than 80 - 100 bucks max or just fix it yourself two dollars for a outlet washer and maybe 15 bucks max for a new inlet valve kit which is %95 percent of leaking loo issues.... I have heard though omega a good for the bigger harder jobs like mains or things like that but I am sure most plumbers can do it also. Again convenience is the issue.
I would suggest people get quotes first if they are happy to get it done a bit later on but save money..