I've got the avent isis and found it great. It does let you set the rhythm which is much less hassle then doing it manually. Having said that, it does have the manual bit, which I used when I went back to work at it seemed to suck much harder and get milk out more quickly! Definitely try both modes. And make sure you put the rose in the right place and take it off if it hurts; managed to crack my nipple a couple of times by being lazy!
Wind Advice for jam - had promised to bore everyone with this anyway...
I knew they went bluish around the mouth with wind but didn't realise:
to wind them on your shoulder they have to be high enough for your shoulder blade to be in their tummy - this is what pushes the wind up..
sitting them upright in your lap and gently 'pulling them straight' is most effective
if the wind hasn't come out after a couple of mins its prob too far down and you need to do baby gym cycling/circular tummy rub/pushing ankles to chest/raising bottom by lifting legs/tiger in tree
wind will make them come off the breast so if they've only done 10 mins its wind if they are bluish - should wind then reoffer - otherwise they'll keep waking up either hungry or with the wind, then kep getting too much foremilk and sleeping only for short periods.
if you can get this right they should feed more, be more comfy and sleep more
there is also this thread on it.