I have a 2000 accord vtec 5 speed and im looking for some more speed

i was looking on ebay and i see a lot of chips that cost only about 15 dollars and add as much as 20-40 hp

i dont know if these are a good idea it seems to good to be true but i checked their feedback and all is good.

should i go for the chip, is it easy to install, does it work good?

any help would be appreciated