This is the second guitar I’ve put the high tension springs in. I play with .11’s so I’m used to adjusting the springs when I swap out from the .10’s that usually come on them. The springs on my HM Strat were worn out when I got it, I had the claw screwed all the way in and my trem was still lifting pretty bad, so I replaced all three springs with high tension springs from FU-Tone and they fixed the issue.
I initially replaced all three of the springs on my Pacer, but decided to just use one of them.
This is the first Brass Block I’ve bought (I’ve not seen a replacement block for a Kahler Spyder or the Strat would have one too), the stock block was 32mm, but the new one is 42mm. Some will have you believe that a new block will allow your guitar to sustain until the end of time, but I wouldn't bet on it being that good! It does add some sustain, as well as warmth to the sound, especially when playing clean. It's not as noticeable as some would have you believe, but it's a decent upgrade to the guitar.
I’ll have to play on it for a few more days before I make a final verdict, but as of right now, I’m satisfied.