Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Is this good for a temporary use (4 hours at an event) to run a computer server rack which would draw under 3000 watts? Is the output stable?
Document: I use this to run a steamer that would be a challange for any transformer and  to charge my Dyson Digital Slim almost daily, aside from running smaller appliances like ice cream maker etc. So this transformer gets used a lot and it has always done a great job without any problems or overheating. I like the off/on switch feature (our old transformer did not have one and we eventually fried it) and that it comes with very good instructions and adapter.
I bought this because I thought the 3000 meant either 3 amps or 3000 watts. So I plugged my 2800 watt Miele vaccum cleaner in, hoping that it would suck my socks off like it used to do in Europe but all I got was what sounded and sucked like 1 or 2 amps max. It works but it's just a bit gutless for its size.
I bought this transformer to operate my 220 volt well pump using my 110 volt generator in the event of a power outage and it works.I do not know the rated HP of my pump, but I can tell you that the steady state current draw I measured is 6.21 Amps at 220 Volts. This corresponds to 1366 Watts, which converts to about 1.8 Horsepower.
We ordered this transformer because we are stationed in England and the transformers that the military lent us were not sufficient enough to run our Spirit Fitness treadmill. We had only 2000W transformers and those would power the treadmill and allow it to run on the basic flat level, but wouldn't let us use the incline function. With this transformer it runs superbly with no issues! So far, we are very happy with the transformer.
I ordered two, one 3000 watts and one 1000 watts. Both arrived damaged. I don't know if this was Amazon's fault for how they were packed, or the manufacturer's fault. Either way, I certainly wouldn't buy them again.
I recommend you buy higher watts then your need then you will not have over heating problems. I got this for my 1600 watts European Kenwood Kitchen machine and I got the 3000 not even 2000 to make sure its never over loaded and last longer. the machine works fine on higher levels. levels 1 and 2 sounds like a car trying to start with a bad battery but on higher speeds it works fine.
I wondered this after I used it to run a HEPA purifier in my room, because it was running continuously. After 8-10 hours it started to get a lot hotter than it did when only running for 1 or 2 hours. I stopped using it continuously and it works fine. It does come with some extra fuses, presumably because some are expected to be blown from a surge in the system or something.
Goldsource STU-3000 Step Up/Down Voltage Transformer Converter - AC 110/220 V - 3000 Watt. I purchased this for my company Maintenance Supervisor and have not heard any complaints, in my line of work, that is good.
I bought Goldsource and brought it to China. I like Goldsource better. I use it almost every day for kitchen applicance, including Vita Mix. It works great and stable. I love it.I also bought another converter of other brand. That one works fine. But ocationally it would cause the electricity shutdown when I turn the switch on.To compare between thses two, I rate Goldsource higher.
Let's see, I purchased this to power all my US spec surround sound equipment, including my 60" plasma, bluray player, vcr, etc. from my British 220 home. (I know, it's 2012 and I said "vcr". Don't judge!) So far, so good. One of the interesting aspects of this unit is the ability to run both 110 and 220 out of it at the same time.
Answer: I am using it to drive a PC, phone base station , speakers without shut it down for almost 3 weeks..