I have the i5/128 SP3 and it serves as a perfectly good laptop. It is as powerful as most laptops out there. I have no problems doing photo editing and basic video editing on mine as well as using Office 365. The biggest downside is unlike a conventional laptop, you can't upgrade the SSD or RAM and it only has one USB 3 port; where as a laptop (even a netbook) has at least two or more USB ports.
Since I have Office 365 Personal, I have 1TB OneDrive storage that I upgraded to unlimited (currently at 10TB and I can ask for more if need be) and a 12TB NAS at home, so I don't have a local storage problem. I can work on photos on the SSD and upload them to the NAS. Office documents I just work straight off of OneDrive.
If I need more horse power, then I can work on my desktop which has an i7 with 32GB of RAM.
So unless you are doing a WHOLE lot of video editing or you are an avid gamer, then yes it is worth buying a Surface over a conventional laptop.