There are numerous tools that can let us perform responsive testing. However, LT browser puts more on the table with the ability to share bugs on a variety of project management tools. We use it with JIRA and it has saved us a lot of time and effort involved in bug logging. Plus, the inbuilt developer tools have helped us debug on the fly. Being a web developer, I personally know how tedious a testing process can be considering the breadth of devices we have to deal with. But to be honest, LT browser has enabled me to be more productive.