The Hark Tri-Fire you mention is nearly identical to the Brinkmann Smoke-N-Pit pro that I used for years (1995-2012). The Hark looks to be a little more robust. That smoker turned out a lot of good food. My only complaint was that it required periodic tending to add wood/charcoal to maintain the temperature. Also, I had to rotate meat so that which was closest to the fire box would not finish earlier than the rest. Typically, when I added wood I would move the meat around at the same time, about every 45 to 60 minutes. Pretty much fool proof. And as a grill, it could hold a ton of food. A real nice set-up. I still have it.
I switched to electric (Cookshack) in 2012 for convenience. Add wood once at the start of the smoke, lock the door and never have to check it till the food is finished. The ultimate in convenience. And for a long overnight smoke such as a butt which can take 10 or more hours, it is truly convenient.
Electrics are well insulated. The Hark and my Brinkmann are just steel. No insulation. I don't believe you can go wrong with the Hark except from a convenience stand point. For electrics, besides the Masterbuilt already mentioned, there is also the Smokin-it, the SmokinTex, and the Cookshack line. Shipping would be prohibitive though.
The electric smokers shown in the link look very similar to smokers available in the US. Good luck.