Rigol Scopes!
Rigol websites do not allow you to register yourself so as to login. It doesn't accept your registration, says it has sent you an email which is never sent.
Rigol websites does not post any scope firmware updates to firmware, does not even mention anything about updates, and even though they are available, you have to call tech support and beg to get one that is undocumented as to fixes, nor is any tech support available except by email on the website. You can contact them by phone and they were honestly trying to be helpful from that way of communication. Only tech support info on website is a list of discontinued scope models.
I requested a firmware update, hoping it would solve some scope problems, but got first an update for their DG waveform generator, then after calling again, got a DS4000 series firmware update with incorrect instructions on how to enter the firmware update mode, I had to discover how to do this myself. The firmware did not solve my use problems with the scope, fixed somethings unknown and made some other situations of use more difficult than the original firmware.
Agilent, on the other hand called me back about questions before purchase and a service engineer talked with me for almost an hour in a phone call abut their scopes, even offered to bring any model by for a test drive. Same experience with Tektronix
Never the less, I didn't send the scope back for a refund because for the very high memory and the price it still was the best economical solution for me, even though this scope has a fair share of anomalous behaviors, especially with slower sweep speed displays, trying to capture a single-sweep, quirky way of shifting triggering modes, some very slow sweep settings are unusable and to save a single 70-mega sample CSV waveform image data to a USB stick takes over 2 and 1/2 hours that locks up the scope from being used for any other purpose...and this is a $3000 US priced model, not a cheaper hobbyist model.