I have been using TradeLog since last year, and it is by far the best program I have found for handling large numbers (100,000s) of trades from various brokers. I had over 100,000 trades from several different brokers (IB, CyberCorp, NDB, DLJ) and TradeLog handled them all. I did find a coupple bugs for the developer in is trade matching algorithm and Quicken Import, but he was very responsive in pinpointing the problem and fixing it.
When I first started I used CyberCorp's Quicken Format to import into Quicken, but Quicken is very slow and gets bogged down when imported 1000s of trades.
Once I bought TradeLog, everything became so much easier. The program is extremely optimized and was very snappy on my P3 850 Mhz even when loading 100,000 transactions.
If you have any questions about it I suggest you check out their website. See link above. I highly recommend it for traders and especially for IB users. The IB import works great, at least for stocks. 50,000 stock trades match up perfectly. I can't comment on handling of options/futures trades as I don't trade those.
Fleance