I only give 5 or 1 star reviews as those are usually the only ones anybody reads. (Why would I care if somebody "sorta likes" or "sorta hates" something?) Anyway, This is a good system. It's definitely worth what you pay for it considering a comparable Pace station is $1000+. I have had mine for a year and have put it through its paces. So here's the bullets: I wish it could read in degrees F sometimes but it can't. The sponge that it comes with is only 1/8" thick and dries out way too fast. Needs to be about 1/2" thick sooo badly. The replacement tips are ~$20 and not all are available on Amazon. (Note to self: don't leave it turned on unless you program the AutoSleep first. It's not preset. Burned up the WQ-B tip the first month.) (Additional note: The default temp is 350C which is too high for lead solder whch should be ~320C.) The desoldering gun is lacking. The design is such that the extractor tip tubes extend into the collection chamber. As a result they don't conduct heat all the way through the tube and the tubes get clogged constantly during heavy use. One solution would be to use a much higher temp but then you risk damage to the PCB. The desoldering tip cleaning tool is made of steel which is fine but it doesn't conduct heat enough to melt through a clog. I made myself one out of 20AWG solid copper wire and of course the copper is more flimsy but it clears clogs better. Calibration requires you to have your own temperature measurement device. They could have easily added a thermocouple somewhere on the unit and a simple subroutine in the microcontroller for an autocalibration would have been sooooo easy. And trust me you want to calibrate it. I have a 2BC chisel tip and a LB conical tip and set at the same temp they are drastically different in temp (even considering the obvious heat conductivity of the two tips; but let's face it, isn't 350C supposed to be 350C? The LB runs about 280C at 350C setting which is beyond the +/-50C calibration correction setting capability.). The temp of the air nozzle is subjective based on the distance from the workpiece and the airflow. This is understandable but some "tips" or "suggestions" for these settings would be nice in the manual especially since there is no built in temperature measurement device. (Come one! Thermocouples are cheap - especially in China.) The SMD profile programming is easy but if you're going to do very much SMD work get the unit they make that has the air gun mounting arm contraption. Holding the airgun steady for a 3 minute profile is fine for one or two SMDs but when your project has 30+ SMDs to solder it gets old REAL FAST.I guess the main drawback to this unit is that it has no thermocouple to read actual tip temperatures or heat gun temps. Whether they incorporate an autocalibration feature or not is just a wish but being able to read your actual tip or air temp is crucial and is NOT part of this unit.