I'll agree with Clive here.

I've used the traditional, cheap solder guns in the past and I hate them. Truly hate them. They're okay to dump heat into a mass of metal but there's no precision, and they are clumsy at best.

Now, the one Boyan linked, I know nothing about, but it's clearly designed to operate as an iron, rather than a gun (45 second heat-up time, "maintenance wattage" and so on). So, non of the advantage of a gun (not that there are many) and non of the finesse of an iron.

Boyan, if you want a crude iron for soldering big cables, why not look at the flexibility of a gas iron? (I've had good work out of a Iroda iron - e.g. ebay item 191949694792), which will double as a hot gas torch for heat-shrinking and a hot knife for cutting plastic fabrics/mesh). And it's completely portable, of course, and the bits are varied and cheap. About as cheap as the solder gun.

If, however, you want something all together different and suited to all-day operation then, as Clive says, a temperature controlled iron, or soldering station. I've grown up with Antex irons so I eventually plumbed for an Antex 660A station (e.g. ebay 380947367317) - though these cost about twice as much as the gun. A good choice of bits and plenty of power - it does anything I want of it. But, irons are very personal items, different people prefer different irons - Weller are well respected but I've never found them comfortable to use - and overpriced IMHO.