Good or bad, hit and miss!
You could have a great experience working for BBC Studios or a not so great one. It really depends on the area and manager and funding for your project/department.
To speak in general terms, this is the BBC's commercial arm and as such is now driven by commercial values as opposed to public service ones. However, the BBC values are still supposedly upheld, at least in programme making. Budgets are tight and staff work above and beyond in general, for lower than market rates. Having said that, you get to have BBC on your CV.