Greeting Chinis. Welcome to VT and congrats on getting off the analogs.
To answer the first of your questions, yes, that mod will work with the Arctic tank and .5 ohm coils. The minimum 0.2 ohms you see simply means that is the lowest that mod can fire. There are some tanks out there that use coils that are less than .2 ohms (for example the TFV8 has .15 ohm coils).
Would it be worth the money is a much more difficult question to answer because so much about vaping is subjective and is really dependent upon each individual person's vaping style and preferences. The best answer would be to answer your question with a question: Is it worth it to you? I haven't used it, but I haven't heard anything negative about the mod. For the price, unless you have your heart set on purchasing from that specific B&M or there is another reason you can't wait for a few days, you can get it online with an extra battery AND shipping for less money. Extra batteries are never a bad thing.
To answer that second question purely from my point of view no, it wouldn't be worth it. Even when I was a brand new vaper, as soon as I wanted to graduate from my starter kit to something more advanced, I wanted to go with something that provided me with what I wanted immediately, but also left me with room to grow even if I never ended up vaping at more than 20 available watts. I wanted the option there.
I would also steer clear because of the proprietary battery. Granted, it is replaceable (unlike many mods with built in batteries) and you can buy extra batteries all day long, but at $23 Canadian per battery, I would rather go with something that uses one or two (or even three) 18650 batteries and offers room to grow. Again, that is me. There are plenty of people who never vape higher than 20 watts let alone 50 watts and there are people who are perfectly content with having mods that allow them to plug in a micro USB cable and charge it. They don't want to have to fidget with external batteries, battery chargers, ensuring batteries stay together, etc. and that is 100% perfectly acceptable. That's one of the many beautiful things about vaping (aside from providing many of us an alternative way to get our nicotine that doesn't involve combustible tobacco, questionable medication, gum that causes heartburn, lozenges that taste bad or patches that irritate skin). There is virtually an endless number of options available to suit every vaper's personal taste.