My review is based on the older Hahanna (2003 or 2004 I think) which I bought for my wife a few years ago. Newer models had a few little changes over the years but were essentially still the same bike, and it may be discontinued altogether now. But, as the older models now represent a good used buy I hope this review is still of use.
The Hahanna was one of Kona's cheaper/beginner mountain bikes, slotting between the Lana'i (bottom of the range) and the Fire Mountain. I bought my wife's Hahanna from Halfords for £300. They were a little cheaper elsewhere but at Halfords I had the option to pay it over 6 months and that was worth a few more quid to me.
The Hahanna came in a lovely dark metallic blue colour (matching my wife's car!), with black stem, handlebars, seatpost and front fork. I chose the Hahanna as I wanted a good quality, well built bike, suitable for road and light off-road use, and for this it was perfect. The bike is fairly light but strong and chunky looking, being made from oversize alumium tubing. The front fork is an RST suspension fork, basic but helps smooth the ride over rough surfaces just fine. The bike has 24 gears (enough for most) with the derailleur, shifters etc. all being Shimano items, lower range 'Acera X' stuff, but decent quality items from a trusted brand. Brake calipers and levers are Tektro items and perfectly up to the job. The rest of the componentry is mostly Kona's own brand equipment, but again, is good quality.
In the 5 or 6 years that she's had the bike my wife hasn't ridden it a lot, mostly due to us having a baby, but now that he's older and also cycling, we are using our bikes more again. Before we had our son we used to cycle a lot though, mostly on cyclepaths, on canal towpaths and occasional proper mountain bike trails. The Hahanna was perfect for all these, and has never needed anything other than having its chain lubricated. It's still in great condition and rides perfectly.
At £300 the Hahanna was worth every penny, and I have seen used models for a lot less, (some of these will have only been ridden lightly making them a good 2nd hand buy, but beware any that have been thrashed). I'd also like to advise that if you are looking for a new mountain bike and have a limited budget, say £300 in this case, then it's much better to buy a good basic bike from the likes of Kona, Specialized, Trek etc. than to buy a cheaper brand that looks better specced, with rear suspension, disk brakes etc. To offer that sort of spec at that price corners have to be cut, and you'll usually find that the components are of poor quality, frames heavier etc. But that's just my opinion.
As for the Hahanna, it's been a great bike for the money, and having an older Kona Lavadome mountain bike myself I like the brand, and would happily buy another another Kona again.
If you want to buy a bike I would recommend that you buy a Kona. If your budget is limited, I would go for a Kona Hahanna. It is the cheapest Kona in the range and is very good value for money, It combines an excellent frame (Alu or Chromo) with respectable components for the price. RST suspension forks come as standard on most, but you can also get P2 forks for trials and inner city riding. In terms of Chainsets, a standard STX-RC a SRAM 5.0. TThese are durable and will do the job required for a low price. The complete bike costs about £300. £300 for a bike from one of the best manufacturers in the world, Sounds good to me!!!.