I tried syntrans and it improved cold shifts but I found as the oil got to operating temp the shift quality deteriorated. Was noticeably worse in hot weather and when working hard.
I now use Motul Gear 300 and it has a better shift quality all round, unaffected by temperature as far as I can tell. The change into second is no longer the crunchy affair it used to be.
Only downside is the price. Bought some on the weekend for $50 per litre but I've never had an issue spending on good oil. It's good insurance and piece of mind in my opinion.

