Respironics vs. Breas

Hello. I am in Spain and I want to purchase a device, but I am not sure if the model isleep 20i of Breas or the m-series with A-flex of Respironics. I don´t know either the differences between the c-flex or a-flex. We need a low pressure, such as 5.5 - 6.
Any suggestions are really wellcome. Thanks.

Well I can say that the Breas unit is not a readily available one here in the states. I have seen and heard one running, but have not had the chance to sleep with it. It did seem very quiet. but I do not know how it would feel to actually use it.
The RemStar M series machines in my opinion are improved with the new System One PR machines. I have one of those now and I think it provides very good therapy.
It is quiet and is very easy to use.

Karen