translating our site and brochures into spanish, machine or human?

Give the editor a short glossary before they start: product names, terms you never translate, and whether you're using tu or usted. Otherwise it drifts page to page and reads like three different companies wrote it. And don't auto-redirect visitors by country. Let them pick the language. Forced redirects annoy people and can stop Google from seeing one of the versions properly.

Both, honestly. Machine translation for the first draft, a native speaker to edit it. Editing is a lot cheaper than translating from scratch and you get a much better result than raw machine output. Where I wouldn't skip the human: brochures (printed mistakes are expensive), anything about pricing, guarantees or legal terms, and your headlines. Machine output tends to be correct but flat, and taglines usually don't survive literally. Decide which Spanish you're writing for before you start. Mexico, Spain and the US Hispanic market use different words for plenty of everyday things, and your editor should be from the market you're selling to. On the site side, put the Spanish pages on their own URLs (a /es/ folder is the simple option) with hreflang set up, rather than a widget that swaps text on the fly. Those widget translations often aren't indexed as separate pages.