I have found Point Direx to be extremely reliable considering the internet version of the software is relatively new (November). Previously the software was written for Direct connections only (eg trading on a floor) as Point Direx has historically been a proprietary trading firm. I can tell you that I was one of the first to trade the internet based platform and it has been remarkably stable for me ( I am NY, PD is in FLA)
Gene I agree with you that there is no reason in the world to consider IB with the competitive commission structure of PD considering the (in my opinion) vastly superior order entry/execution capabilities of PD.
TO answer your question Gene, the way the order entry interface works, I can enter bids offers very efficiently (ie quickly). So when accumulating say 500 shares of a stock, I will usually take the offer on a 100 or 200, bid out 200 at the bid price, bid out 100 at the bid minus a cent, and bid out a 100 at the bid minus a few cents etc. Often, as the stock is wiggling around within a 5-10 cent range, I can get many shares passively (cheaper) than by taking the offer on all 500 to open the position.
With 1 cent spreads, I think we are all a little guilty of the "Oh heck I will just pay the offer price its only a penny more" syndrome. But when you consider that you can often acquire a good chunk of the position at or slightly below the bid if you give it a few seconds, it can start to add up.
For example, assume 10000 shares a day traded (thats ten 500 share trades with round trip). THen assume you can get a penny better price on 1/3 of these shares with better execution features/tactics I've just described. That's about $7,000 a year in reduced commissions if I do my math right, which based on what I have seen since converting to PD is not unrealistic. FInally, this ignores the impact of getting stock at the offer or selling it to the bid when the market is moving quickly which the PD platform is simply awesome at. If starts to move fast, I am getting in or out way faster than I used to that is for sure. Hope that helps.