Magnetic secondary glazing?

[diggingforvictory]

I'm thinking about getting secondary glazing as our house is freezing but plastic windows would look hideous. I've found a few companies online that make a panel held in place with magnets (eg. //www.magneglaze.co.uk), but I'm a bit sceptical. Does anyone have it, and does it work? Does it look nice? Is it much cheaper than getting a company to install more conventional secondary glazing?

[JohnnyRod]

Do a search on here, I've seen it in other threads and it didn't get a good write-up. I'm casting around meself for SG.