Wow, buy 4 tips and get the soldering iron free! If it seems too good to be true, it probably is. Mauroh, I doubt that I would personally try it. I also have the FX-951 and I will say that it is worth every penny. You don't know how stable the power supply is. Yes, you can adjust the temp. Does it have setback features? I don't see a silicon pad to remove the tips. That would be an extra cost. I have a collar for each tip I have. Easy in and out and I don't even need the tip removal pad. I won't mention the wand holder.
For you and eugenine, here is what it boils down to. How often are you going to use it? What is the range of uses? Strictly SMD or SMD through 10 ga wire and every thing in between. What is your time worth and, more importantly, what is your frustration level worth? My dearly departed father would always say, buy the best tool you can and only buy it once. You buy a cheap tool and it sucks and it isn't worth the trouble of returning it, then you buy a different tool with the same result and further down the rabbit hole you go until you spent the cost of the really good tool trying a bunch of cheap substitutes with the attending frustrations and then spend the money that you should have spent up front. I don't solder for profit, I solder for fun and it's a lot more funner with my FX-951 and Metcal MX-500 than it was with the firesticks and the Hakko 936 that I have owned.