I didn't use them and nor did anyone else as far as I could see. Surrounding area a mix of 90s estate that's prettier than its reputation, flats abandoned mid construction, and light industrial. I've stayed in much more unattractive bits of Birmingham, but wasn't warned against them! IIRC there are rings in Bootle too, but again not a recommended area.
Booked two nights in Salthouse Dock and ended up paying for more, it is very good and I don't bother paying elsewhere.
Litherland was gated and but very busy and the only good bit about the surrounds is the supermarket, and Maghull looks pleasant enough but you'd need the bus in from both.