If you find the hood shape of the new Ultegra comfortable and like the shifting, go for the 105.
Make sure your wheel is compatible.
Oh yeah, bugger. The wheelset I was going to use is 10 speed.
As for hood shape, I'll go take a test ride somewhere. I'm used to SRAM shaped hoods.
@TRA started
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If you find the hood shape of the new Ultegra comfortable and like the shifting, go for the 105.
Make sure your wheel is compatible.