PCB heat bed

Ok lulzbot is out of silicone heat beds for the taz
I found a 24 volt pcb 12X12 heat bed online for 50 USD
I was wondering if there were any advantages or disadvantages to a pcb heated be over a silicone one.
I know with my prusa i3 i like the PCB because i have multiple glass build plates and i just swap them between prints so im back to printing within 60 seconds of finishing a print. i never have to wait for my prints to cool to get them off the glass i just run cold water against the back.