i've used rean for a couple of time, but i disappoint to it's quality, the build quality is the most problem to me.
i've also try pailics, ranko, mps, amphenol... and they are cheap also, specially pailics, it's nearly same price to rean. in my country,pailics and amphenol easier to get.
why pailics and amphenol are batter than rean in my sight, because i thing, they have better build quality, better looks ,and better sounds ...
pailics has good high freq detil, good bass controlling, and better separation.
amphenol is better in high freq control, good mid freq, and less bass for the one who don't like much bass quantity.
Perhaps, but i don't get the flame near the heatshrink. I start a good distance and slowly get closer as i wave it back and forth. I get very consistent and controlled results every time. The biggest downside is the the flame is small and narrow, so more back and forth is needed, a wider source of heat would make things faster. But my lighter was free
The butane torch I picked up years ago actually has a slider that you can push forward and cover the air intake making it a reducing flame. I still really like the safety of flicking on the heat gun with round shroud and rotating the part in there. Some of the bigger stuff ½" and up takes a lot of heat.