I have used Gossen's twice now and are absolutely impressed. I have had dealings with two different Gossen plumbers and both have been fantastic.
The first time they came and snaked my bathroom lines and the job was very thorough and so much better than another plumber I had who came and snaked the lines just the year prior.
Today I had a basement toliet blockage and the job was unpleasant to say the least. The technican who came out was extremely professional and was very helpful. They recognised that this job was urgent and slotted me in their already tight schedule. And when the job took a lot longer than expected they stayed here until it was fixed rather than telling me to reschedule which has happened with other trades before.