I had couple of 26″ Orange Five before. There are pros and cons.
Pros:
Although my Yeti 575 is a much faster and easier to ride bike, I would say the Orange Five is more rewarding to ride. If I have the money and space, I will have another one any day.
It is a bike that I will ride in all weather, the single pivot system is so easy to maintain I wouldn’t worry about getting it wet and muddy.
Cons:
You pay a scene tax for owning a Orange Five. When I sold my last one, the 650B revolution already began. It was in really good condition with a nearly new Kashima RP23, new bearings and a Maxle rear end, but the frame went for nearly £600 on Ebay which was quite a lot. It funded an upgrade to a Yeti 575 + a Cotic Soul which worked in my favor.
If cost is a concern, don’t go for an Orange 5 as you might not get as much for your money.
Things to watch out for:
You definitely need a small. I am 5ft 7 and was much more comfortable on a small compared to a medium. I ride Medium with most other manufacturers for your reference.
Other than that, try and go for a later one as they are less likely to crack and the geometry is better. Orange kind of gradually improved their design base on warranty claims and feedbacks.