What is your favorite source for replacement tips on the Metcal? I have one (SP200) I acquired at an auction ages ago but its missing the tip. Was always meaning to get one but my Hakko was my standby so never got around to it.
I have never used the SP200 it's smaller and lower frequency than the MX-500's I use.
I purchased both Metcals used on eBay and one of them came with about 10 tips, since then I picked up a couple of tips at Digi-Key. The Thermaltronics tips are compatible.
Go to tips for 90% of what I do:
STTC-145 for most small PCB related
SMTC-0147 for larger connections
My hunch is after you use it once, you will never want to use your old iron again. The technology is just that much better.
It's like using a Starrett 91B vs. a dollar store tap handle, it just works better in every way.