I've just bought the Estlcam software (through work) as I tried it last night and was impressed. It's much quicker than CamBam for doing RC bits (all I've tried at the moment...), I managed to do the CAM for 4 plates (600mm x 400mm) of nested parts in Estlcam last night in the time it normally takes me to do one in CamBam as it selects the geometry for you, if it's drawn correctly, instead of you having to join the lines into groups before you can select them and apply the CAM to them. CamBam also has the annoying habit of putting one random inside profile in an outside profile or viceversa.....I've just cut another plate for my Marabu plane and found one piece which has cut incorrectly like that. I normally spot them but on a couple of occasions I've missed them (rushing.....I know no excuse!) which means creating a new drawing for just that one piece....which is annoying

I'm sure that I'll be using both bits of software but at the moment my preference for what I do is Estlcam, just thought I'd say!