Hyperpro

[nsr500v4]

any good? Either front kit or the rear spring to replace the standard stuff. Worth it?

[Mattsplat]

Just bought the Streetbox kit and fitted their rear shock yesterday.
 
Rear shock is quality, not got around to fitting the front springs yet

[seangee]

any good? Either front kit or the rear spring to replace the standard stuff. Worth it?

Better than stock but not nearly as good as a half decent shock and makeover for your forks. Front end kit probably ok for most users. But there is a limit to how much you can improve a knackered budget shock by fitting a better spring. Tried the full kit on mine and ended up going with a Nitron at the back and properly weighted linear springs up front. If I had to do it again I would skip the intermediate step 

[FuZzBoM]

I have Hyperpro springs front and rear. (spring on standard shock)
A set of Ohlins it isn't, but for the price it is a good improvement over standard. My issue is that I am 17 stone and with all kit on and a full top box the weight goes up more. 
On standard springs I had preload up full and it felt soft and bouncy. With the hyperpro I have preload front and rear about 2 from top and I find this firmer than standard. Fork springs also come with the recommended oil as well.
Some people give the fact they are progressive springs a bashing. I think people forget this is a sport touring bike so a bit of give is a good thing in my book. helps with the crappy UK roads.

Would I fit again? Yes I would.