i work at ETG and still use redi+.....no one in the NYC office has switched yet, and from what i understand, some are using gr8trade for charting, but very few, if any, are using it's platform for trading. so, i don't know where you are getting your information from (not that it isn't true, but i don't know anyone using it).
we are waiting for the new version due out in february, which will get data directly from the exchanges like all good plaftforms do (not comstock like gr8trade currently does). more mouse friendly, indications, imbalances, open book, etc, etc, etc will all be in the new version. i told them i would not switch unless these features are included, and they said they won't force anyone to switch, confident people will switch on their own. bullets are integrated, which alone will be a step up.
i haven't used anything other than redi+, so can't compare. but, i can tell you the stability of redi+ is absolutely horrendous, freezing, slowness, outages, stuck orders, position monitor not updating, etc, etc. etc. . if i thought about it for a few minutes, i could easily come up with a handful of redi+ tech issues that have cost me maybe 10k or so in the last few months. the most recent was a few weeks ago, when i had maybe 5 orders, each in the thousands, and during one of redi+'s infamous outages, it wouldn't tell me whether they were open or filled for a 5-10 minute period. i couldn't tell i whether i was long 2k or short 3k of a particularly wild stock. i went from being up over a grand to down over 1500 in this stock. that's bullshit.
if it's reliable, and faster, like our president keeps telling us, i'll be happy with the switch. he swears it is already faster than redi+ because the data is stored on our servers, and will be even more so once they switch data sources. i anticipate an adjustment period, as anyone should.
if you ask me in a couple months, i'll give you my honest opinion.