I use a combination of the two. The downside with TSM is that the AH can be upto an hour out of date (or hours if the TSM app can't get the snapshot) - running a profession or full scan on my server is unfeasable due to the size of the AH. If I want to make a quick price check or buy some items in bulk it's sometimes quicker to use Auctionator. The other nice feature is Auctionator can perform a much more limited realtime scan of the AH - eg 'Contenders Leather' - returning all the current item prices within seconds. This would have to be done as part of a shopping list or profession scan in TSM. It'd be nice if Auctionator could update the datastore with the latest snapshot of whatever items it sees.