I have to disagree with 100mg being like a cup of coffee. For some, for sure. But not for all. Have known folks who find 200mg to be way too strong with no tolerance too. And those that would barely notice 200mg even with no tolerance. Huge variations from one person to the next with trams. I'd definitely not recommend 200mg straight off, myself. Not gonna kill ya or owt but can definitely make you feel like utter crap for a day or so.
Also, the evidence for whether or not benzos actually reduce the seizure risk is divided. Pretty sure I read at least one paper suggesting they can actually increase the seizure risk slightly in combination with trams. Don't recall which benzo was involved in the study offhand but think it was diaz surprisingly enough. Doubt it makes much difference one way or the other, to be honest, but I definitely wouldn't say it was a guaranteed 100% safe combo. 99% safe through probably. Folks have had seizures on just 100mg of tramadol too. Very rare to seize, for sure, but nowhere near as rare as 1 in a billion. Check the tramadol megathread in BDD for tales from BLers it actually happened too...