The msi based installer was introduced in 0.91. It has several flaws - beside some benefits using native platform installer framework.
1. does not detect old exe based installation
    but: installer should report directory already exists ...
2. does not allow win32 and win64 side by side installation
    but: prevents doing so
    can be implemented, but I think it confuses user which application is linked as .svg application
3. is not localized
    I am working on how todo: localisation of installer with single msi file
4. does not allow easy upgrade
    but: will ask for deinstallation first
    Patch commited for easy upgrade
5. some reports of not linked .svg to inkscape application
    not yet investigated
As of the nature of things before starting localisation all outstanding features should be implemented.