I got the PDP TE stick a year ago and "upgraded" with an IL Eurostick, a heavy spring, Happ competition buttons, and Cherry switches. The result: no difference between the feel and play of the stock Happ stick and the IL (some people say the actuator on the IL is better, but I don't see it or feel it). The heavy spring was too much work, so I ditched it and put the stock spring back in, but that felt loose. I took the spring from the IL (same as the stock spring in Happ) and stretched it about 1/8" to get more tension. So that was all good. After switching the buttons out I found that I preferred the stock concave ones and put them back (just today I went back to the convex and I'm gonna stick with them for a while). The Cherry switches were an improvement, and yours comes with them stock, so your good.
Now, after all that, the issue I have with the stick is that the bat top is too high off the surface to play comfortably, and there's too much throw, which makes dashing a bitch, especially to the left (bear in mind, I've been a pad player, so the stick is a learning experience). I've been thinking of getting a Qanba 4RAF to satisfy the desire to play on both systems and to have better control with the stick (though I've never used Sanwa/Seimitsu--I'm assuming they're better by reputation). But after the mod I made on the bat top shaft today, I no longer feel that way. Here's what I did:
Measured 0.7cm on the bottom plastic:
Cut it:
Reassembled using the center groove for the e-clip and now the bat top sits lower:
The tension was a little too much so I put the stock spring back in. Now the throw is shorter, my hand position comfortable, and the inputs more accurate. I'm finally happy with the PDP stick. Hope that helps.
when i get it all cleaned up and wrapped up ill let you know. i want to get a decent amount for it, but i know i wont get anywhere what i paid for it 
