Well, I bought my shed from Tiger sheds. It's up, but not overly happy with nails sticking out of interior, some wood not treated, leaky windows, delivered 24 hours late (took time off work - Grr!) and customer services that don't get back to you.
Some interesting negative reviews on Trust Pilot (he says after buying the shed. Doh!)
Interesting, I am looking at possibly having an extra shed in my garden (for patio furniture, BBQ etc.) and was looking at Tiger due to me thinking of having a wooden one (I currently have a metal one), your comments certainly don't paint them in a good light.
I know majority companies have issues and things can go wrong but I'm a firm believer that how you treat customers and react to issues is what can set you apart in this world, if they aren't getting back to you (what kind of time frame are we talking hours, days, weeks?) then that's not a good image in my eyes.