Following from this thread, the brakes have well and truly bedded in so have now been able to see how they compared to the 314s that they replaced (which replaced the 302s that came as standard on mine! lol).
Initial pressure on the pedal gives a nice progressive initial bite, with slightly further pressure all that's usually needed to brake in most circumstances.
Approaching a roundabout on a dual-carriageway at motorway speeds and leaving the braking a bit later than normal, for the purposes of testing, therefore requires a firmer push on the pedal i.e. a bit more travel and you can really feel the power of the brakes kick in as the car is quickly and firmly slowed down, yet it's still a nice progressive feel on the pedal and pedal travel can't have been more than half way! You almost don't want to push further as you know you're going to be hauled to a stop even more quickly!
Final test - involving quiet stretch of road and travelling at motorway speeds. Apply very firm pressure to the pedal and really push down hard on the pedal and OMG!! - the power with which you slow down and how quickly you come to a stop is somewhat impressive! - yet all the time the pedal feel is very progressive and you know that just lifting off a bit, or pushing down more, will give that bit less or more. Some powerful brakes are almost like on/off switches in how they react - not these. They are nice and progressive with plenty of feel, yet oodles of power if needed. I thought the 314s were good (which they are) - these are something else! The only 'worry' is that if ever an emergency stop is required, the person behind can't stop anywhere near as quickly!
Soooo, final verdict. A very worthwhile upgrade even from the 314 kit, and from anything else - 302 or 285mm - will be a massive difference. The only 'catch' is finding a set going for a decent price and in good nick - I'm pleased to say that the set I got were both.
I just hope that the discs, and hopefully the pads, will see me through all the time I will have the car for given the jaw-dropping prices of them - particularly the discs! I've just sold a complete 'as new' 314 kit for less than a set of the VXR discs cost!
EDIT: One thing I forgot to say is that I noticed (over the 314s) that the 345s noticeably need a little bit of warming up before they're working at full power. I know that applies to all brakes but I noticed it more on the 345s. It's nothing too bad, just literally a few applications of the brakes and that does it, but one to be wary of if it's a really cold day and you haven't applied the brakes before you approach a roundabout at speed! lol