It all depends on what type of work you're doing. I recently grabbed a base i5 refurb for the office and its completely fine for my purposes. My work flow is primarily MS Office, lots of PDFs, web browsers, and a little bit of coding thrown in. I rarely do video/audio editing so I didn't feel the i7 was necessary, but I did want an SSD. I added an SSD and it's perfect for my use. So far I don't notice much difference in average daily use between the i5 mini and my 2012 15" rMBP, which has the i7.