Here is another scope:
http://www.eleshop.nl/images/product_DSO100.jpgTroniq DSO25/DSO100; compare that to the Siglent, well... rebadged.
There is a little webshop here that sells the Troniq 25MHz 500MS/s 4K memory for 250 euro's (300$ aus). The 100MHz is 350 euro (420$ aus)
Still I'd get the Rigol, because it's 'only' 500MS/s for 100MHz version, and 4K memory dept isn't that spectacular.
Although, it did seem much faster than the Agilent's Rigol one. Hmm, lot of bulk added to conform to Agilent 'standards'?
I think firmware wise they probably have some kind of agreement between each other. Maybe Rigol has some subsidiaries we don't know of.
The interface seems so similar.
I can imagine that the 'scope technology' is home made, but the interface parts are all identical.
I think the Unique is the same as Tenma:
http://uk.farnell.com/tenma/72-8230/digital-storage-scope-60mhz-2-ch/dp/1739444(Farnell number 1739444)
Isn't Tenma Farnell's brand? Hmmm
And here at Conrad, we also have Voltcraft:
http://www.conrad.nl/medias/global/ce/1000_1999/1200/1220/1224/122464_LB_00_FB.EPS_1000.jpgNot sure which one that is..
And we also have Uni-T's
http://business.reichelt.de/bilder/web/xxl/D150/UT2042C-AR.jpgThe only manufacturer that seems to make their own firmware is Owon;
http://www.eleshop.nl/images/product_SDS6062.jpgThat one is about 450 euro here; 100MHz, 1GS/s, 10MByte memory. But some say the update speed is very slow, even slower than all Rigols.
Gosh, so many 'cheapies'. I guess everyone can do 500MS/s or 1GS/s 100MHz scopes these days with a Cyclone III + fast ADC's..
Shootout?