When CONCORD is already on grid the response time drops to 2 seconds in 1.0 to about 8 seconds in 0.6 and 9 seconds in 0.5.
When CONCORD isn't on grid, it will take about 22 seconds them to arrive and start firing in a 0.6 system.
A Thrasher has a cycle time of 7 seconds, and does about 1000 damage per volley. So for a ship that costs less than a 1 million ISK you can be suicide ganked for 1000-2000 EHP in a 0.5 security system where CONCORD still has to spawn. The same setup in 0.9 would only do 1000 EHP of damage.
If CONCORD has already spawned in the system and is not on grid, it's possible the Thrasher can do 3000 EHP damage in a 0.6 system.