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I love the PMC bass. Transmission line is not for everyone but I've been sold on it for years. Having said that the KEF are likely no slouch either. The only set of PMC I bought new were direct from PMC when they wanted customers to upgrade from the DB1SA so I got a decent discount. I've not heard the Twenty5 23's either, it seems unlikely they would disappoint, but would they be significantly better than a second hand older model from PMC ?
It's certainly not a deal breaker for me but I have had one of my hypex repaired/upgraded under warranty by PMC (they did both of course!), so keep hold of your receipts for warranty stuff.
One other thing I've learnt over time is heat can be a bit of a killer over the years. Try not to keep them on all the time. I did that with my early ones but eventually PMC let me know that it can shorten the lifespan, not especially with Hypex but I'm careful about not leaving them on 24/7.