Rather than paying for the digital controls of the 938, look at the basic analogue 936 clones.
They are very cheap around GB £22 if purchased here rather than the Far East, but they are a lot better than most all in one hand held irons, despite lots of adverse reviews, but then they are always compared against the likes of the FX888D etc at 4 times the price.
My 936 has lasted a year, so if it blows tomorrow I will just buy another... as anything better just seems silly money for basic circuit work.