I slapped together a quick at-a-glance feature comparison, based on the available datasheets:
Well, the differences still appear not that big from your table, because even obvious features like twice the sample rate and memory (and consequently higher bandwidth, faster peak detect and lower trigger jitter) in the SDS2000X HD are missing.
But also some less obvious things:
+ Memory Traces only in SDS2000X HD
+ Trigger Holdoff by Events only in SDS2000
+ Zone Trigger only in SDS2000
+ Histograms only in SDS2000
+ Customizable trace colors and RGB-LEDs in the front panel only in SDS2000
+ Digital Inputs: Fully integrated solution in the SDS2000.
This has the following disadvantages for SDS800/1000X HD with regard to digital inputs:
• Since SLA1016 incorporates a complete SOC and local memory, it cannot be cheap even though the probe head and the grabbers leave a cheap impression.
• Mixed analog / digital pattern trigger is not possible.
• Zoom mode cannot be used as soon as digital channels are enabled.
• History doesn’t work either when digital channels are activated.