I think that it is easier to keep what you have for now and start bringing in the newer line in stages.
That way you can do some marketing of your "new" treatments along the way.
If you end up LOVING your new line and don't want to keep your old line at all then you can make that decision later. That way you don't ditch your old line before you are ready.
thank you Cindy! that's great advice! I guess I get sort of "stuck" mentally where I feel like I need ONE line... but I suppose having a few to choose from is good for my clients b/c everyone is different!
may I ask what lines you are currently working with?