I opted for the thermal framed windows in place of the frameless windows I had ordered after I heard about frameless leaking problems. I am happy with the framed windows, and did not feel comfortable ordering frameless with my background in window installs in homes. While more attractive without the center posts, the glued laminate frameless windows can fail, and the single point plastic screw lock seems way under-designed for the job it must do, plus there are instances of the hinges leaking, which ETI now provides a cover grommet thing for. Things to consider however: ETI could not provide a thermal framed window in the bath and kitchen, and the big front and rear windows are not thermal with the framed window option, at least in the 2018 model 19 I bought. So, be aware that non-thermal windows will sweat a lot with inside condensation to wipe off every morning after cold nights, and non-thermal window let in more heat/cold, and neighbor noise.