The Zeny 853D I purchased was like $70 or so... if I recall correctly - I'll see if I can find the amount...
I was low on funds then and I needed something which wasn't the cheap hand held non-adjustable soldering irons... You remember the ones which took MINUTES to heat up, and then you heat a wire and the wire sucks up the heat before the iron can regenerate you you can to hold them together for MINUTES before the temperature between the wire and the iron equalizes so solder actually flows onto the wire..... They were so bad...
Anyway, mine heats up in seconds to max temp and it ready to solder a few seconds after ( after heat transfers through to tip - one thing I don't like is the tips have too much air around the ceramic heater element which causes a breakdown in heat transfer... I did get 2 tips from Radioshack which are much better quality and they hold heat much better so the issue is in the tips, not the unit )...
The heat gun attachment is really nice too - and it also generates power up to 15V 1A... Super useful... It's better than nothing and if I were to buy something similar from a brand it'd probably be $300 easily...
I've build PCBs with it, and it has given me years of reliable service... I even modified mine - normally the heat gun is attached 24/7 but I bought the same type of plug the soldering wand / iron uses with the appropriate number of pins and I cut the wire, and soldered the wires to the pins inside the plug and now I can remove the heater... Which is actually a good thing now because it gets in the way and the holster for the heater is terrible so it'd always fall or get in the way... now I can plug it in when I actually need it ( and I'm going to experiment with other wants, and thing such as vacuum solder guns etc when I get a wiring diagram together, and other wands which use different tip types )....
If I recall correctly, there were reviews on it ( under different names but 853D ) and it performed quite well which is one of the reasons I bought it... And it was inexpensive... And brand-name units performed similarly or only negligibly better so 1 second in heatup or whatever.... but again - the issue with this unit is the poor quality tips which come with it - the rest seems great...
I have no trouble putting together PCBs from scratch using soldering paste with the heat-gun, or soldering the boards using the iron / wand from scratch and it never loses heat after it initially heats up and bridges the gap... at least, it hasn't yet...