I think it's just been launched in the UK, but to me, it sounds akin to the likes of NSI Line-Out....although I could be totally wrong here.....knowing me!!
I believe that you should prep for a rebalance thoroughly ie no line, and so products like this shouldn't be a necessary part of your service.
I tried Line Out when I was pretty new and I have to say it didn't help me at all. I went back to the basics of prep and product application and this solved my problematic rebalances and I chucked the Line Out in the bin!