US signals

[Hardwicke]

Does anyone have any experience of Southern Digital signals or signal parts? I know they are HO but how reliable are they and what sizes are the bases and posts? I am looking at the signal base part 6062 and the searchlight signals - called on their site 'Target Verticle Signals' and 'Target SIgnals'. They look like they could be adapted for P4. Their website is http://www.sodigi.com/signal_heads.htm