Gtechniq Exo and Crystal Serum Ultra fail very quickly(~1 year after installing). They lose their water repelling properties. You also get tons of mineral spots if you're not surgically careful. I lightly talked to the company about their products and others who were having similar issues but they didn't do anything about it.
Their spray wax is very good though.
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So we sent an email outlining our thoughts which caused a response by phone, which was we thought was waffle and requested a swap of machines but this brought an offer of a new one with a discount of 拢20, which as we had spent 拢300 already on their equipment we declined also we have had to unsubscribe from their web site which we did not wish and agree to. So thanks Mr. Grey.
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I have always had a 5* opinion of their products and I am pleased to say this is now match by their service.
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The names of the items can be a bit confusing but you soon get used to them. Pete at Gtech is especially friendly and helpful. Items are alwats dispatched quickly and there is also a forum you can visit (detailing world) or just email them and they are more than willing to give application advice.
If I could afford a Supercar then I'd still be wanting to use Gtech items as they are super products.