It's the card designed to finally make Street Magic shine :).
On a more serious note: the real question is, how good is this in it's true home of Ob Superheavy Logistics. If the runner breaks but lets the trash-this sub fire, that probably means there is going to be a Border Control on this server for free through their ID 'Obgrade' ability, ending the run at the corps whim.
So if you want to get through on the same run, paying 5 with Paperclip or even Propeller is expensive enough that you start to calculate how often you would want to do this. This may get better with time, but on a run you want to succeed at, this will never be less than 4 to break with Clippy against Ob. Also unlike Sandstones strength, there is no known way of hastening the process of eroding the subroutines - at least yet. Notably, at least in the Startup format you're looking at
a much worse with 6 or 7 for Cleaver,
7 or 8 for Corroder as well as
8 or 9 for a Gauss that's been around for a while, or 6 or 7 on the turn it was installed. That's pretty hefty and a good reason to not skimp on the influence for your fracter looking back to Standard.
Also be on guard if the Ob you are playing against uses Envelopment
to get a Fractal Threat Matrix . It probably means they are about to Excavator it,
Obgrading into a Crisium, Mavirus or the combo piece MCA Austerity Policy , depending on what's going to annoy you more. Probably the latter, but Mavirus is the only one to not need more time or Excavator support to
Obgrade to a NASX - which in turn
Obgrades to a Urban Renewal and that you're always sad to see as runner.
As we are talking sad already:
Envelopment gets released
Happy Grappling Hook and Street Magic noises - but sadly not in the Standard format anymore.