Hi Richy
The Tamiya Tiger is a bit of a classic but is starting to show it's age when compared to the new Dragon offerings. I'm not rubbishing the kit, I've got 2 more to build myself (early and late - possibly a hybrid hull).
I always replace the barrels with metal upgrades, as I do think they're worth the money and prevent warping or drooping over time that you sometimes get with plastic, so to me the halved barrel isn't an issue. I have just pieced together the 2 halves to the Tamiya 25 pdr though and the join is completely invisible (as far as I'm aware no after market barrel is available) but maybe the Tiger barrel fit isn't as good.
The individual track links are down to personal preference. I prefer the individual links as they do offer more detail and you can model a realistic sag in the track, but I agree they are more time consuming. If you think putting those tracks together is tedious you should try riveting a 1/32 Typhoon wing - the upper wing took me 3 evenings work! Also, if you ever think about buying Model Kasten tracks remember that the working Sherman track consists of 6 parts for each link!!! I think it's all down to what you want to get out of the hobby. I think some people will spend years on one model and are prepared to spend weeks on getting just one part right, others want to complete a model over much shorter periods. I don't see either of these approaches as wrong it's just down to individual choice.
I've got some Dragon DS tracks for the Tiger 1 if you really want vinyl tracks (as vinyl tracks go they're the best). If you like, you can PM me your address and I'll send them to you, but honestly, if it were me, I'd stick with the hard plastic individual track.
Cheers
Paul