I bought this mobile phone, and I m very happy after using it.It is working very well.You may be able to make the argument that 8 GB of storage and 1.5 GB or RAM are not enough to beproductive with Marshmallow. In my experience, unless you’re gaming, 1 GB is more than enough RAM.
But, with devices such as the BLU Studio G2 on the market running Marshmallow with 8 GB of storage and512 MB of RAM, it is obviously possible to run Marshmallow with those specs. However, you may not enjoy the experience.