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@Dammit
I'm not familiar with 2300, but my Allez had Tiagra (it was the entry level model) which had the same shift layout- i.e. a Campag style thumb control for shifting into a higher gear.
In terms of reliability it was 100%, in terms of ergonomics I did not get on with it.
That aside I'd really advise trying to get 105 as a minimum as it's a ten speed group, and you can then interchange 10 speed parts.
I looked at upgrading my Allez, but as it was 9 speed it would have meant upgrading too many different bits to make it economically viable, so I flogged it and bought a bike with Ultegra