Yes - I have become somewhat of a fan of Aluminium tailpieces
Like PhillyQ says they do seem to sweeten and open up a guitar tonally
I have been using the Gotoh ones with good effect.
The other thing I do is use the tonepro studs that clamp down on the top of the tailpiece

I feel this gives much better transference of vibration from strings to body as it all locks down and give complete contact/coupling with the top and bottom surfaces of the tailpiece.
I much prefer these to the tailpieces with the grubscrews since I feel you get more solid contact and vibrational transfer
They are a popular option on my custom built Lion models and will be standard on my 20th anniversary model which will be out im the new year
This is a body shot of the prototype (fitted with Abraxas humbuckers currently)
