In your example there's no advantage. The disadvantage is that you're writing redundant code, and most programmers will look at that and think that you dont know what you're doing.... and wonder what other bizarre programming habits you have.
I always use 'this' for member-variables, as part of my personal programming style - but I'm consistent in doing so.
A) It differentiates between member-variables and local-variables.
this->memberVariable = 200; localVariable = 200;
Other people prefer prefixing their member-variables with something like 'my' (i.e. myMemberVariable) - it's the same idea, but with a little more typing on my part.
B) It kicks in the intellisense. Typing 'memberVariable', intellisense won't kick in immediately until I start typing. I have to remember what the first letter of the variable's name is, which normally isn't a problem. If I type 'this->' the intellisense kicks in and gives me a list of all the member variable names.
Yeah, kinda silly , but I've never minded the extra typing. this-> this-> this-> this-> this-> I just pretend 'this->' is the namespace of member-variables. I fully type out std:: also. this-> is only a tenth of a second slower to type than std::.
I have to think while programming anyway, so it's not like I'm transcripting something where every word-per-minute counts.