I use a Met Bad Boy for everyday riding.
Its a great design, and excellent value.
The vent holes are fewer and larger than high-end models, so you can fit a shackle lock through a hole. You cant do that with expensive helmets.
The fitting is done by a flexible nylon band, so it can accomodate heads of any shape as well as size. Ive used helmets where you replace foam pads to get a fit, but they get worn and dirty, and the fit is never as good as a band.
The removable visor is useful in the rain, and a reflective tab on the rear is good.
For everyday riding you dont need a highly aerodynamic or ultra-light piece of kit, but it has to fairly tough.