The model of the derailleurs is probably of no consequence. What will feel different to you is the brifters, which are somewhat sneakily labeled R460, which is, I believe, Tiagra level. You can, I think, still get 105 shift levers in 10 speed, so they could be changed without having to change the whole drive train and would cost, probably, a little more than $200 for the parts. As far as I know Ultegra level components are now all 11 speed, so you'd have to find NOS to replace the levers with Ultegra.