I just uninstalled my Empeg sled and amp from my Subaru
I'm not using the car much (mainly use Eryl's Passat which isn't Empeg friendly) and the Empeg even less. I probably haven't taken the Empeg with me for about 18 months.
One of the reasons I haven't been using it is that it has an annoying intermittent buzzing that is probably a poor connection in the sled. I never got round to sorting that out.
The main reason however is that I have all my music and probably more importantly, my podcasts, in my pocket all the time. Having a separate box that I need to sync music onto doesn't seem to make much sense any more.
The Subaru currently has a radio/cassette unit fitted back into it, as I'm thinking of selling it. If I hang onto it much longer I'll fit a cheap Bluetooth head unit.
I'm hanging onto all my Empeg kit though (~4 sleds, 3 Empegs, several tuners and a remote mounting kit). I can envisage a time in future when I've got a nice* car that I might spend the time to get an empeg mounted along with a Bluetooth box plugged into the aux.
* still holding out for a TVR Tuscan one day