IsNot in vbnet - a more readable way to check for Nothing

When I have written Vbnet and checked for Nothing I have chosen between 

    If Not( o Is Nothing ) Then
        ...

and

    If False = o Is Nothing Then
        ...

and

    If o Is Nothing Then
        '    NOP.
    Else
        ...

all ugly and/or hard to read but in their own way.

Some days ago I stumbled upon IsNot and since then my code looks nicer like so:

    If o IsNot Nothing Then
        ...

I have been writing Vbnet for years without finding IsNot so I thought there are more out there with the same problem.