We live in Bealings. We moved out here from London a few years ago and love it. I work in London every couple of weeks but my husband commutes every day. He cycles from here to Ipswich station (about 30 mins or so) but he's insane so don't try that 
I know lots of people who commute from ipswich to London. It's OK and doable but I don't think anyone thinks it's much fun to be honest. The trains here have NOT been at all good on a regular basis, especially when the weather is even vaguely inclement. And a 4 hour round commute is a long, long day. I think it's really taking its toll on my husband TBH, he looks very tired a lot of the time and basically commutes/works/sleeps during the week. He works a short day, leaves home at 7.40am and is in the office for 9.45ish..gets the 5pm train and is home around 6.45pm.
There are LOTS of excellent primary and high schools around here, we're spoilt for choice to be honest. Primary schools are still allocated by catchment.
If you're going to tackle the commute then I would recommend buying somewhere that is walkable to the station, it will make a massive difference to the commute. The fast trains ARE fast, but don't seem it if you tack on a drive to the station AND a tube at the other end.
that said, this is a wonderful place to live. We are so happy to brining up our boys in such a gorgeous place with easy access to beaches, the forrest, wonderful countryside, brilliant schools. We have never regretted the move but, as I said, i think my husband really pays the price with the commute and I hope he can cut down his days in the office (currently does 4 a week).
If you can afford somewhere up the line (maningtree, colchester, chelmsford, ingatestone etc) I would seriously consider it.
HTH.