I've used Gumtree alot over the last 5 yrs especially. Have no complaints about buying things from the site.
For my to sell/promote my business on the other hand. I've had my account restricted more times than I can count. When I've emailed them to sort it out they've told me they don't pro.ote my type of business. Yet there are at least 5 others promoting the same work that I do. Unbloodybelievable they are.