To back up Freight Train,years ago I paired a Fender 410 with a Fender 115 in a stack but the 115 would always fart out too early. In that particular case the 410 was preferable to two fifteens IMO. Plus the fifteen was getting half the wattage output of the amp which was too much for it, while the 410 could easily handle its half of the output then plus some - hence the farting of the 115.
So far as tens versus fifteens go, I used to be a tens man through and through but some of the new fifteen cabs are right up there. My (sadly no longer produced) Bergantino 215 is more open, faster and punchier than many 610 cabs I have played - but it does have a 6" driver as well (incidentally it sounds fabulous with the 100T). I like the Fender Neo 610 cab with the 100T because it does "move more air" - as Freight Train puts it 60" of speaker cone versus 15" or even 40" of a 410 suits the 100T nicely because in the rare occasion that 100 tube watts are not enough you still get some apparent boost from the extra cones mocving more air. Hope this helps.
Yes a big help. im about to throw some big dough down and just dont want to have any regrets. its pricey but totally sounds worth every penny. especially having 18 months to pay it off w/o a dime of interest, the 610 is it. Then to have some covers made. Oh yea and Tim +1 on the 100t over SB300. Maybe if there was a BM200.

