We recently purchased two transmitters from BW and a STL transmitter/receiver set. Due to local regulations BW had to custom modify the STL transmitter/receiver. They were not happy about the performance on the testbench and did not send us the unit until they were 200% happy we got the best. And we did! We got a STL set that is much more expensive than we paid for, just because BW wanted us to have the right stuff. A lot of e-mail went back and forth between their staff and our engineer to make sure everything is as it should be, pre-configured. After that they offered us a RDS unit at a good price because it had scratches on the outside of the unit. Who cares so we got a great deal on that too. We're a small local station that won't bring them big orders in the near future and they know that but that didn't kept them from offering us the best price.
Regarding the build quality. We have them on-air for just 6 months or so, can't say anything on such short time of operation. But one of the transmitters is high up in a church tower subjected to the elements of nature. The previous transmitter lasted more than 10 years. We'll see what this one will do.
Nothing but good words about their sales, support and general attitude towards customers.