I just hit on my "lifetime guarantee" documentation for this tent, that I bought from Tizo's in Scotland on 16-9-1995. 22 years later, not heavy use but now and then, including a number of Hebridean storms, and this tent remains in perfect working conditions. Some of the pegs are slightly bent, the poles are arched but not in any way that affects their function, and I have never once had a fabric rip, groundsheet leakage other than slight dampness, or anything snapping. I have found the design of this tent is perfect for one or two people. It's very easy to set up even in stormy conditions. The porch is perfect for leaving boots and bags outside but reasonably sheltered from the rain. The elastic bits have, astonishingly, kept most of their spring over all this time.
Bottom line - it's an amazing tent. No built-in obsolescence, at least, not in the vintage when I bought mine. I can see why you felt confident to give a "lifetime" guarantee (haven't checked if that's still the case) and if it carries on like this, that will be my lifetime, not the tent's.
I just wanted to thank you for making such a good product. The problem with so doing, is that from people like me you won't get repeat sales because I'm happy with what I've got. It's therefore important that we generate sales by word of mouth so you stay in business and keep the model going. All the best, Alastair McIntosh.