I made comparison between SDR1000 with a traditonal good receiver, using a headphones 

Test criteria

I listen received signal in:

• Different bands, mainly 40 and 80
  
• Different mode, SSB, CW, RTTY, BPSK
• Different time 
• In contest and outside contest I have been doing the test for 20 hours not continuesly 

Configurations Antennas

• 5 els in 10-15-20
• 3 els in 40 in, 2 els  80 metri (home made)

RX

• SDR 1000 audio Delta44,  PC Pentium Dual Core 1Gb ram (dell 520)
• IC 765 - Roofing filter della INRAD - Filtro 2,1 khz SSB INRAD  (455khz) - Filtro 400Hz CW INRAD (9010,5 khz)

Test tools

• A good relay to switch headphone and antenna together 

Results

• Low signal without noise à I was able to read with both receivers signals at noise level
• Single signal with heavy atmosferic noise (low band) à SDR is more readble, and DSP filters halp a lot
• Many signals and many adjacent stations (contest) à SDR is less subject to intermodulation; loweirng the pre-amp level you get improuvement

 And then with SDR1000 I appreciated:

• Quick Filter selection with a mouse click
  
• Equalizer menu permit you to easily adapt receiving to your ears
• Software is robust (no crasse) and interoperabily with other DX software is easy (with virtual Com port and Visual Audio Cables)
• DSP filters are flexible and permit you to easily adaprt to the signal received
• The newsgroup world is a great folder where you can share problem and solutions