If it does what you want now, then great. But be aware that Microsoft can just drop support for things that don't sell (Zune, PlaysForSure, and will happily change things so that they're incompatible with old devices (Windows Phone 7 vs 8).
They'll in theory support the hardware until 2017, but the software support for Windows RT, they are very vague about, which suggests they have an open mind on dumping it, or at least aren't so confident that they're willing to commit to it:
"Microsoft will make software updates, including security updates, available for Windows RT. Additional information regarding the Windows RT lifecycle policy will be communicated as available."