Hello again.
Yes, the children do like the structure of it. They do the same thing every lesson. Every child (except for a v. SEN child) has made progress.
The 'Fred Fingers' (like sound buttons in L+S) activities, used for sounding out and spelling are really popular, and you can see children working out spelling during writing activities using their fingers.
We were originally worried as there is not much writing done in the early stages, but fingured that it was a good idea that chidlren should learn to walk before they can run. We have found that, because of the continuous plugging of sounds, blending and reading, we have also found that the early writers have progressed.
I particularly like the 'hold a sentence' activity where children have to retain a sentence and reproduce. How those boys struggled to begin with!! 
There are a few resources we have found we don't need now (Get Writing books in particular), but it was useful to have these when we started out.
Our TAs are brilliant and all take groups of children - they have been a godsend.
One thing - we run RWI for 4 days and then do literacy with our own class on a Friday - usually a writing task connected to the creative curriculum This has meant that we (as the class teachers) have a handle on where the children are, and whether their targets are realistic. This has also made it possible for class teachers to write reports as normal, and then pass to RWI teachers for checking. I would strongly recommend that one day off RWI, just to touch base with your class of children.
The children have been great moving round - even the very littlest ones in Y1. Also, some Y1s have been working with the top Y2s, and keeping up with them.
In the beginning, it's quite a lot of hassle and MUCH more work than the trainer implies. It's not just 'open the book and follow the lesson', particularly when books are introduced, which is quite early on. With the books, there are writing activities to prepare and think about.
Anyway - we love it, and will be continuing next year.
Children have also been heard to say 'we like RWI because the children who know all the answers all the time aren't with us so we can learn better.' (Paraphrased slightly, but that was the gist!)