IMO, if Multicharts can build their IB trading interface up to where a strategy can get account info and stay in synch with the account then they are ahead of Tradestation... The best of Easy Language worlds would be trading out of Tradestation with a fully featured interface to IB, it's disallowed by Tradestation in your agreements but not enforceable afaik.
The data hassles with Multicharts can be a challenge, that is the beauty of Tradestation, all the data hassles are transparent to the user, click on one of a thousand symbols in Radarscreen and whambam, a chart is pulled up in a second........ and it's a good looking chart too, Tradestation is easy on the eyes...