I have it here for 3 to 4 years. Quite frequent use. It is quite powerful, heats up very quickly compared to something else of the same price, but the most important thing is... it does its job perfectly fine. I have put a Hakko tip on it and it doesn't wear out anywhere. It even soldered a complete IC with 144 pins without any damage.

I don't know about 40 or 45 watts, but simply put, the difference is not significant and definitely doesn't change the expectations of a soldering iron that costs 35 euros.

Get it without fear.

You don't enjoy it...and it's 40w, not 45.
I would suggest you go for something else with more wattage, like 48 and above with ceramic.
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Update 7.7.20
It doesn't work and constantly burns the tips.
The customer service is completely awful and they also charge you for shipping.
I sent it twice for a problem it had.
Stay away from this particular one, which is not even 45w but 38w to be exact.
Give something more and get something better with over 48w as I have mentioned, and ceramic.