Hi Chris
I wouldn't in any way try to say whether you should use it or not.
I've had a quick look at the Evans site, and from what I can see it's a propylene glycol based product.
There is a lot of data available on propylene glycol, for example at Dow chemicals
here.The boiling point says it is the simple form of propylene glycol (1,2-propanediol) which has a nominal BP of 187C. I suspect the slightly lower value quoted is because it is hygroscopic, absorbs water from the air, so reduces the BP.
Some of the "issues" Evans discuss regarding "water-containing" coolant (ethylene glycol type) aren't really issues in my opinion. Engines are designed to use ethylene glycol/water coolants. Local boiling, either film or nucleate, is not an issue providing the local velocities are sufficient to scour the gases away, which is how the cooling passages are designed. While steam doesn't conduct heat away well, the process of boiling absorbs a lot of heat (latent heat of vapourisation) and as such can be a quite effective way of removing heat, the steam gets scoured away to a cooler area and condenses again back into the coolant. Note too that the specific heat capacity of propylene glycol is only around 0.7 of that of water, so in liquid form it won't absorb as much heat as water based coolant for a given temperature rise, suggesting it needs either a greater flow rate or a greater "delta-T". That may not be a great issue in practice, but it should be considered.
They are trying to make a case for why their coolant is better than conventional ethylene glycol mix, and fair enough that's business, but it's not always necessarily a balanced story.
I don't know a lot about the chemistry of propylene glycol coolant, but a quick look at Wiki
here and at the Amsoil equivalent coolant
here indicate the need for inhibitors with prop glycol, and how it can have it's own set of degradation issues when used hot and with any oxygen about and in the opresence of metals (i.e. a vehicle cooling system).
It is widely used as a coolant in food processing and domestic areas where it could be ingested, it is essentially harmless.
As I said, use it if you decide it is a good product, but bear in mind that sales blurb doesn't necessarily give the whole picture.