Why are you guys so down on the curbing? There are so many colors, textures and styles that it doesn't have to be tacky. How often do you change a customer's beds anyway? If you want to change it, just cut it and take it out. The installer would be glad to come back and install a new section. It's effective in keeping mulch in beds, grass out of beds, makes edging easier on you and if you want to make some extra profit without investing in the equipment, get hooked up with someone that installs it. They may pay you a commission for the referral. I do. Seems to work. Don't be threatened by the curb!!
Oh, and by the way, it is VERY durable and will last for a long time. I choose to apply a color hardener that has a higher PSI rating than the concrete itself. The customer gets a durable edging that lasts a long, long time.
I would go with Borderline all the way. Patrick Roach, in Phoenix, is the man to talk to. He trained me, sold me my setup, and gives terrific support ANY time you need it, he is only a phone call away. I have been in the business for about two years, and am actually selling mine, due to some personal situations, nothing to do with the curbing business. It can be very profitable, and customers absolutely love it. Of course, it isnt for everyone, but what is. That's what makes the world go 'round, everyone is different. What a boring world it would be if everyone thought alike, don't u think? If you want more info on Borderline, they are on the net at www.borderlinestampusa.com. They are first class, and will help you every step of the way, they truly care about your success!