The E20 was the earlier model; bigger; heavier, it has DV in so you can hook up your camcorder. The E-30 was launched a month or two ago; is slimmer, a lot cheaper than the E20 started out at, does not have DV in, but does have an easy Flexible recording mode, allowing you to specify the amount of time you want the disc to last (ie you can set the player to record a 2 hour 20 minute film on an entire disc.) The E20 only has this facility when using a timer recording, making it quite tedious to use.
Otherwise, I believe the funtionality and specs are identical.
My advice; if DV in is not that important, definately go for the E30.
If you can, go for the HS2, which has all the above functionality, including DV in, and a hard drive for discless recording / transferring of RAM recordings to dvd-r, which is a massive plus.
Just for your info. If you do decide to go for the E30 they're £397 from http://www.rgbdirect.co.uk/mainscreen.asp or if you are close to a John Lewis store they will price match and give a 2 year warranty.
Ricky27. The FR (Flexible rate) function is much better on the E30. On the E20 you can only use the FR function with the timer on the E30 that restriction is not there. I have both machines and there is no difference in picture quality that I can see. Both are brilliant in that respect.
Although in my experience so far I have found the E30 to be just as picky with cheap media as is the E20. Malcom.