As mentioned previously, the built-in cabinet sim in the Le Bass is really very nice!
I compared it A/B-style against "Fridge" sims I use in the Torpedo CAB and believe I would be quite satisfied with only the Le Bass cab sim if I did not already own the Torpedo CAB. It is surprisingly punchy, warm and alive-sounding, not at all like a simple low-pass filter or other analog shortcut.
Even so, the deal-breaker in my case however is that the Le Bass cab sim is only employable on the XLR and headphone outs. I really would have loved to have the cab sim also selectable on the 1/4" output. After experiencing how good the built-in Le Bass cab sim is, the lack of this feature is quite disappointing now.