If you could get it for less than £100, I think it's worth a shot.
But I wouldn't pay good money for one - the power output of the donor car is a good indication.
The expected donor-vehicle speeds are also a good indication of the frontal airflow restrictions you're about to impose. (a slow vehicle will have more dense fins, which on a 150mph car will suffocate the engine bay)
Survival at high boost pressures is anyone's guess - can you trust a low-pressure cooler with 20+psi?
It's not just that it might blow open (hell, even 'uprated' i/cs sometimes balloon!)
What if an internal turbulator breaks free during an overboost spike?
The Frontera intercooler isn't that bad actually, they are very well built with welded alloy end caps. As for the fins, both internal and externally they are not what I would call dense. The internal fins are very well constructed, in fact the whole intercooler makes the standard cooler look cheap and nasty. The main problem is with the 90 degree bends coming in and out of the endcaps.
A Nova on here was running phase 3.5 with one without any problems, they are not ideal but for £100 what do you expect?