I use OEM Trico. They work really well and are silent in operation. Although in saying this, it depends on the condition of your windscreen to a degree with regards to them grabbing and jumping about also.
Trico are OEM on alot of Holdens and people sometimes don't change blades for years but then they go out and buy a cheap as, ugly looking bright silicone ones that are cr#p. Why not spend a little bit of time and wonder why manufacturers blades lasted so long in the first place....probably because they were half decent items.
So if you have had a set of blades on your commodore from new and its been a few years and they seem to be okay still, but you just want a brand new set, then why not go to Kmart or the like and buy another set of Trico premium metal backed blades and you will see that for the cost of approx $10 each or thereabouts, they are a decent product.
It just amazes me why people don't realise that things like wipers are a necessity and not a fashion statement and going cheap just doesn't cut it.
I have never used Bosch, but if they are $30 a side, then I couldn't and wouldn't justify them for that price unless somehow they can last 3 times longer and perform 3 times better than Trico, but I doubt that.