Depends on your requirements. The 100MHz TDS-1012 doesn't fix any of the limitations like the memory depth. With the 2.5k sample memory it is basically an analog scope with storage, .
But also it can look opposite.
Analog scope is full BW also with lower time/div. And long time it was analog scopes super advantage far over digitals. (more in history)
If digital scope have small memory, it affect just so that BW (related to realtime samplerate) is extremely limited if small memory.
Example as Owon, it makes just this
advantage that it is nearly as analog scope becouse deep fast memory.
I do not know how Tek 2.5k is arranged related to display time/div.
IF display is example 10div horizontally and if whole capture memory is displayed on the screen it means 250sample / div.
(it is not if I quess right becouse Tek have long practice to put around half outside of display.. (1/4, display 1/2, 1/4 or something like this if trigpoint is selected middle) in some older digitals. But lets assume it is all in display.
Ok what happend if set example 500us/div. What is then samplerate.
10div is (
in this imagined example) 5000us. Memory is 2500points.
5000/2500 =2. It can take every 2us one sample to memory. It is then 500kSa/s
Well with this speed it is 250kHz scope if look theory as Nyquist. (This is only if we KNOW that maximun frequency component is 250kHz then we can say it can display 250kHz (sinewave).
In practice we can better talk that it is 50 - 100kHz scope with this speed. (if it is arranged so that example there is 20div capture but display window to captured signal is 10div wide it do not change in practice in this meaning)
Yes, Tek have 1GSa/s maximum but, with 2.5k memory, what time/div it can use it?
It means ADC data byte every 1ns. So there is 2500ns time to fill memory.
If think it is 10div. It meand it is 250ns/div. (But in Tek solution it is maybe 100ns/div or nearly where it do 1GSa/div but it is only quess becouse do not know how they arrange horizontal divisions releted to memory... maybe it is 100us/div where is reach 1GSa/s but it can not happend lower than 250ns/div if there is 10 horz divs on the screen.
Look example Owon.
Also with this 500us/div it is still sampling 1GSa/s and so it is fully and clearly 100MHz scope.
Even if go 1ms/div (500MSa/s) it is still 100MHz scope.
This imagined example (nearly as this Tek) 100kHz -- compared to Owon example what is more than 100MHz.
1:1000 difference. small difference?
Ok lets think you look only 100kHz. Why need more BW... well where you need oscolloscope if you really know your signal what you are looking. Example if you look pulses or some oscillator or what ever and if there are example parasitic oscillating... what you see with this 100kHz scope... nothing but screen full og aliases. Analog oskilloscope never do it... and fast sampling realtime oscilloscope much more less that this kind of Tektronix slow sampling piece of history.
More slow time/div speed but more sampling speed give more this effect what analog scope can do and what still digital scopes try emulate. (yes best realtime scopes are today better than even best analog scopes in mosta cases.
This more sampling speed with lower horizontal timies can do only adding more fast speed sampling memory.
(I talk also now only about realt time sampling... this "equal time" sampling or "repetitive" is piece of bullshit in cheap oscilloscopes.)
And in this meaning 1000E Rigols are far below Owon.
Also in this special meaning Hantek is some amount below Owon.
Rigol is ok and it is cheaper than Owon, it is cheaper than hantek but difference is not much.
Of course sometimes this money difference is much and in this meaning I think Rigol is still very good value for money.
If can use littlebit more money you get much more with Hantek or Owon.
No need take more than display. tiny 320x240 5" compared to really good 7" 800x480 or 8" 800x600 TFT is really BIG difference and these scopes also use TFT in native full resolution.
And no need hack and crack... these are allready 140-150MHz oscilloscopes. (both 100MHz models)
Hantek 60MHz is nearly as Rigol 100MHz. And more if do FW modification what is also more easy and safe to do than Rigol.
(becouse Hantek have doors open Linux)
So, what is Rigol...
It is good scope if can not use anymore than its price.
It is lot of better oscilloscope than this Tektronix.
If need something more with littlebit more money.
Hantek and Owon is good. (they are not real competitors becouse they have so different strong and weak points)