Bought a top of the range walkman phone which had problems after only a few months of ownership and has always suffered from bad reception (no signal more often than not) a problem I have never experienced with any other phone on the same network and at the same time (my GF's phone is on the same network and shows 3 bars or more when mine has none). SE would not replace the phone and only offered a cheap/nasty outsourced repair service, my phone came back with faults and the faults that were repaired happened again after the warranty had expired. 

I will never buy any SE products again no matter how good they are supposed to be! In my experience the longevity of their handsets is questionable, the after-sales/repair service is poor, rubbing salt into the wound given the premium prices charged.

Maybe the Xperia X1 will help.