Like most things, soldering can be a matter of personal preference. I have used Resistance Soldering for a 20+ years, but very rarely on track. A soldering iron works (I use basic 40-60 watt units), and so does a res soldering unit. I have rarely melted a tie, but it's a matter of technique. If you can possibly try?out the res sol unit before buying it (try a friend's), you can make a more informed decision. But don't automatically assume it's better. Perhaps just get a little more practice with a soldering iron on a spare piece of flex track.?