I am very happy with my surface pro 4 and I have been using the normal surface keyboard that attaches to the tablet. I have had no problems with that keyboard other then perhaps its a little small but that doesn't really bother me. Since Microsoft released the foldable keyboard I have been eying it as a replacement to the normal keyboard. I like the compactness and the ability to use it on my Android phone. The reason I have not pulled the trigger on the foldable keyboard is the normal keyboard acts as a cover for the the screen. If I was to not bring the normal keyboard then the screen would more liable to becoming damaged I think. I could carry both the normal and the foldable keyboard but that hardly makes sense I think. Bottom line is I would really like to carry the foldable keyboard but its not logical to do so given the form factor of the surface form factor.