Here's what I ordered around 2015 for my PB Simple Metal.

https://www.amazon.com/dp/B0013HKZTA/ref=pe_1763890_134303290_tnp_emaildp_1

Heat transfer is fine.
Being thin is a good thing, otherwise you'd run into issues with the induction sensor probe.
That said, my Z induction probe had already failed by then and I had already replaced it with one that can trigger from further, but you should really be fine with the stock one.
Just make sure to recalibrate your Z probe after installation (both physically as well as M212), because your bed will be a tad higher and the hotend will otherwise dig into the bed.

Considerations:
With PEI, I barely have to "squish" that first layer, unlike with other beds.
If you squish it down like you used to you might very well need a chisel and hammer to get your parts off. Not kidding here, I had to get a 1" chisel and a deadblow to get a large print out once or twice.

I just trimmed and glued mine down on it with 3M transfer tape.

FYI: The kapton, I hear, is great for ABS, but I'm personally not using that.

PS: Prusa, I think, is also making those removeable magnetic, spring steel, PEI coated bed surfaces which sounds absolutely magical, but my plain PEI sheet is still going strong after I installed it in 2015 so I haven't looked into them too much.
The removeable spring steel magic allows you to simply flex the surface to get your stuff off it.
It's an ideal printing surface, but I havent looked into retrofitting one on a printrbot.

DM me if you need a hand, gl.