Are lenovo desktops good? Gaming/work (specs in details)?

I'm going to buy a pc for work and gaming.

I saw this lenovo h50-50 in my local tec store and the specs are the following:

intel i7-4790 3.6ghz

16gb ram

gtx 750 ti

280W power supply

2tb

The specs are good for gaming (I think) but I'm concerned that after a few weeks/months the hardware or whatever is going to start failing and giving problems.

I saw in nvidia website that for the gtx 750 ti is recommended a minimum 300W power supply but the provided is a 280W. Is there any problem with that?

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