If you talk about the concept of the surface pro, I would give it a 9/10. Detachable keyboard, tablet with full fledge window. Pretty light, reasonable battery life, rather hassle free service support
If you are referring to reliability, I would have given 6/10. Within a year, mine spoil twice. 1. Keyboard suddenly spoil (got replacement within 3-4 days) 2. Software corrupted (got a reburbised set within a week). If you ask me whether I will buy another surface pro, I would say no unless I get extended warranty. Typically quite difficult and expensive to repair without warranty. For a machine that doesn’t even survive the first year, I will be prepared to write off at Year 2 once warranty runs out. This is an expensive window tablet/ laptop. I would have gotten a dell/ Lenovo instead
Again that is just my personal experience.