I know that most people do not believe in new things, and even the experienced laminators are very sceptic when they should try new things. Never change a running system, I am also a fan of this princip.
But most people which will tell you they never have problems with pinholes, dry areas, voids, resin waste..... will have these problems sometimes more or less.
We have a lot of customers who infuse all their parts with MTI now, and they infuse since years and a lot of parts.
For them most times the process stability and the reproducibility of the quality is the most important thing. For the DIYs how you called them it is most times the chance to get a perfect part with much less experience in infusion.
Of course can you produce good parts by infusion without MTI hose, but it is much easier with MTI hose.
Also the physical pros of the hose are there and you can not deny them. The MTI hose is no miracle cure, but it will help you a lot.
If you do not have the correct parameters you will not get even a good part with MTI, but if everything is correct you will get a very nice part.

I have purchased and used the MTI hose and had very good results but have also had the same using the normal practice using spiral and and catch pot etc. I do like how it works and it is an excellent product and easy to use (compared to the standard practice) but the major downside for me is the cost @ 27.80 Euros for 5 metres compared to £3.50 for 10 metres of spiral.

I love this product, hands down. As said, I have made some decent parts with the normal method, and further perfection is likely to result in pinhole free parts. Yet I have used the MTI hose on the last couple of parts and it works as described. Sure, it is expensive, but it saves a lot of time, and makes things much easier. The last part i made came out beautifully, no single pinhole on the whole part, no in-mould coating. Very high fiber to resin ratio, the part sounds very "ceramic" when tapped with something metal.

Either way I would suggest easy composites become a dealer for this in the UK, because as your name states, your products should make composites easier, and this certainly does. Even high-end professionals and consultants in the industry endorse this stuff.

cheers