I am in no way knocking Skoda reputation as I owned a Felicia for 18 years (That was a joy to own) and the only large repair bill ever had was for new clutch and have never had any experience with cars that have an immobiliser system.
I have now learnt the "hard way" that buying any used car of any age?, could possibly develop an immobiliser fault and if no simple fix available, then this can result in an expensive repair.
Of the "old school of thought" I would prefer to pay higher insurance premium for a car that does not have immobiliser system, than be under the constant worry of every time ignition is started that at some time you might then be left with a non runner or have to keep entering SKC to get mobile again or fork out ££'s. I'll be saving up for a new car as from now !!.