I recently upgraded to the latest version of basecamp and bought a new subscrition to birdseye imagery, and downloads are so slow and buggy that it's essentially unusable:
1) Every time I try to download an area with more 1000 tiles the download process freezes partway through and never restarts.
2) Even if I go through the process of downloading small areas (less than 1000 tiles) at a time the download speed is horrendously slow (multiple minutes to download 1 MB of data, even though I'm on a 12 MB/SEC connection that will stream HD video.
This is rediculous, and people have been complaining about the slow (deliberately throttled?) download speeds for years.
By comparison, downloading satellite imagery to my delorme GPS is at least 100 times faster, and doesn't freeze. Ditto for loading satellite maps onto my android tablet to be viewed in the trimble mytopos app.