Barry when you buy one and drive for a year or two and sell it successfully then you will go through the real learning process. I can go on with this topic until my fingers bleed, but I'll keep it short:
Weather specs are only one worry and yes it does require alteration and modification and after that, you can safely enjoy non-gcc specs car in UAE. This process if you are not highly educated and mechanically well off then workshop here will rip you off and you will finish all saving you made by buying the non-gcc specs in one go.
Secondly, as desertdude mentioned, all imports are either flood damage or accident written off, again you should have a real keen eye to identify a clean car among the bunch of lemons. And trust me used car dealer here are so smart in covering things up that even the seasoned eyes can get fooled. I got saved twice purely by good luck, when all my experience and knowledge said its cleaned and even the testing guys generated a clean title report. Lucky while getting the insurance come to know that it has been written off by Al Tayer and that's why no guarantee on 4 years model who supposed to have 5 years guarantee. Workmanship here to hide things can get to real hideous level sometimes in the automotive industry. So take no chance in such pass the bug game, or else you might get stuck with that bug for LONG LONG time. I know more than 10 friends who are still driving import purely because they can't sell it.
Last but not least is the terrible resale value, as they depreciate faster than GCC cars and after getting it cheap, you will really regret selling at even cheaper resale value, as the market is always flooded with these imports and people are always desperate to knock them off and used car dealers are very competitively priced to drive these car prices lower every month due to endless supply from abroad.
Long story short, I highly advise everyone that pay 10-15% extra and buy GCC cars, so you will enjoy the ownership and you will be able to sell it off at a fair price after you are done.