Upgrading a T-O-M bridge (?)

i´ve swapped the saddles with graphtech ones and like it.
Also i´m told that brass bridges tend to have more sustain than other materials.
 
I don't like the Graphtech saddles all that much, personally. They sound duller and less bright than good metal saddles.
 
I don't like the Graphtech saddles all that much, personally. They sound duller and less bright than good metal saddles.

That was my experience too.

I tried graph tech saddles on my strat and I knew straight away that I didn't like them. They smoothed out the top end, making my strat sound less 'strat-like'.

To be honest the only thing I think is worth it as an upgrade to a TOM is a high quality locking bridge - and even then it is mostly for functionality. The ability to take your entire set of strings off without losing your action setup is well worth it IMO. If tone-pros stuff fits I'd research their bridges.

I've only changed a TOM bridge once, to go from a stock Epiphone bridge to a higher quality one - can't remember the brand but it could have been Schaller? The main advantage was no longer having that thin wire across the adjustment screws. Other than that I wished I'd just spent the money on several packs of fresh strings instead, I didn't think the tone difference was that noticeable.

Maybe someone else will have had different experiences than me, but IMO unless the bridge is causing you functional problems I'd probably keep it and buy more fresh strings instead.