Valentine have a good name world wide.
With technology leaping forward so fast, a current detector can be out of date within weeks or months, but enforcement tend to stick to what they have for budget reasons so your money won't generally be wasted to quickly.
I'd ask around the car clubs and similar locally as to what works and what doesn't and go from there.
Before moving to Australia from New Zealand, I had a Mitsubishi GT3000 twin turbo so a detector was first thing on my shopping list. I bought a uniden 5000 from memory (about 5 years ago now) and it was current for laser, fixed camera and most speed guns at the time.
Illegal here in Australia so now it is just gathering dust in a cupboard somewhere.
Mount them as high as reasonably possible so they can have a good chance to see the laser/radar beam.
Also don't ignore the good old Mk 1 version detector (the eyeball) as it is often just as effective as the electronic version.
Oh, also there are some devices advertised as "jammers". Don't waste your money. They don't generally work.
Reid