Only those marketplace products which actually indicate that they are responsive, are responsive. The theme itself however is not responsive, although as mentioned above we plan for this to be the case by the end of the year. Our themes are not encrypted, so you are free to customize as you wish. The additional features you mention are only part of the child theme if the description of the products says it is included. If not, then it would require additional modification on your part.
All theme price information can be found on our
pricing page. Thanks.