Interestingly the toolkit shown is the Ikea toolkit "Fixa" - I wonder if there's not IP restrictions on their use of such an image.

Edit: I saw this quote on the Mackeeper website you linked (it is good design) "MacKeeper was noticed at Macworld by a journalist from Cult of Mac". So I chased that phrase and all I found was algorithmic page generators like this http://drgogek.com/is/is-mackeeper-really-a-scam-cult-of-mac....

Using a different tack CoM mention Mackeeper in a single page found from their search box, an affiliate promotion page ... using Google unearths more promotions, https://www.google.co.uk/search?q=site%3Acultofmac.com mackeeper.

So, it looks like their quoted reviews are from people they're paying to sell the product, that's a warning sign.

Didn't investigate further.

Do a search on google for "chrome" and you get any number of adverts for junkware installers before the actual application... this is true of any number of legitimate apps. Let alone if you are duped by an illegitimate app to begin with.

Surprisingly, it does - I just knew them for their shady ads and popups which clearly scream "don't install this!", but this website looks absolutely legitimate. Color me surprised.