advice on guided rafting Franklin River

So I finally think I've persuaded my hubby to 'consider' rafting the Franklin for a special anniversary coming up next year! While we are busy saving up the $$$ I thought I would seek advice on how to choose between the different guides. We've never done guided walks before so I don't really know where to start. There seem to be three main companies that offer a guided trip for the full length of the river:
1. Tasmanian Expeditions http://www.tasmanianexpeditions.com.au/index.php?section=trips&id=285 - 9 days
2. http://www.franklinriverrafting.com/ - 10 days including Frenchmans Cap
3. Water by Nature http://www.franklinrivertasmania.com/ - 10 days including Frenchmans Cap
We only have very limited kayaking experience so I'd rather go with a guide who knows what s/he is doing. The camping/walking is not an issue, we've been on 7+ day trips and have all the gear. All the guided groups look very similar on their websites and the prices are also fairly similar. Two leave from Hobart, one from Launceston. Two return by bus, one by seaplane (weather permitting).
Have you done the Franklin River trip with any of these groups? What was it like? When is the 'best' time to go?
Thanks,
sim1
1. Tasmanian Expeditions http://www.tasmanianexpeditions.com.au/index.php?section=trips&id=285 - 9 days
2. http://www.franklinriverrafting.com/ - 10 days including Frenchmans Cap
3. Water by Nature http://www.franklinrivertasmania.com/ - 10 days including Frenchmans Cap
We only have very limited kayaking experience so I'd rather go with a guide who knows what s/he is doing. The camping/walking is not an issue, we've been on 7+ day trips and have all the gear. All the guided groups look very similar on their websites and the prices are also fairly similar. Two leave from Hobart, one from Launceston. Two return by bus, one by seaplane (weather permitting).
Have you done the Franklin River trip with any of these groups? What was it like? When is the 'best' time to go?
Thanks,
sim1