Hi. I have a TDS2024B. Damn nice scope. Has features I hadn't dreamed of. Has a warranty that won't quit. Got mine at Fry's for $2200, a couple hundred less then elsewhere, without the two to three week wait for shipping.
I have been perusing the Instek model GDS2004's manual since I got an email offer for $1800, $1636 with coupon. This model has an optional battery ($385), which the TDS doesn't. So far the manual is a good read, no Chinlish, and a partial review suggests it is a TDS clone, except for the battery and a lot more storage memory. Scary part: there is nothing about a warranty or guarantee, I searched the .PDF manual!
A big thumbs up for the Tek; the GDS is definitely worth checking into, but the warranty is a concern.
Hope that helped,
kenjj