The Sony ICF-SW55 is a very well-known and good world receiver with a lot of special features: 125 alphanumeric memories, timer, world clock, SSB etc. etc. Reception on SW is very good and SSB works very well, too. But all too often there are image frequencies. This seems to be a common flaw with the small receivers by Sony. Often, there are stations to be heard around 910 kHz of the selected frequency and with some signal strength at that. Except for this, the SW55 is a top receiver, which offers a lot of functions like no other radio.
A hint: In central Europe with strong stations around, you should operate the SW 55 only with its telescopic antenna, which will result in clean reception. (Less is more!)