Hi Petra,
We have bought 3 Masterlite couches at our clinic and have found them generally very good value, though not always the most stable e.g. for very heavy clients or if you are using rocking techniques or impulse work they tend to move a little.
Likewise the head attachments are prone to loosening thought these can easily be tightened with a small Allen key, which we now keep handy!
The ones our therapists and clients like best are the Thermo-top couches with the built-in heater. If you can afford one, these work out cheaper than getting the standard couch and then paying for a heat pad separately.
You are welcome to come and try one out!
Paul