Front does not open on YJ sliders??? Not so, depends on brand...there are several makers of them...I got mine on eBay and they were stated to be "original Mopar accessory from a '95" so I assume they were Bestop built, the canvas and hardware all seem to be BT? They have dual glass that open in either direction, front slides back, back slides forward, mine also do not have a black molded frame around the glass, just canvas, mine are spice...they are great, IMHO far superior to zipper plastic windows and look much better. A little quieter too...they use the same frames at half door plastic. I do agree that they do not open as large as the old window zipped down but the airflow is still very good, and if weather warrants, you just take them out and put in half door armrests....Look out for a good used set before shelling out $300+ for new ones, I paid half that...
Obviously, from the statements made here, some folks love sliders, others hate them...just like some like big women (or men , ladies) and others skinny, to each his own....see if you can test drive someone's jeep with them first, if a strange jeep owner approached me with such a request, I'd take them for a ride.....