The original shell was cracked with me after a few weeks (admittedly intense camera use). This spare, I have now used seven weeks in the US (temperatures below 0 to almost 40 degrees, incl. Trekking with loosely slung over her shoulder camera) and there are no defects.
Only the softness is more comfortable with the original. If this, however, comes at the expense of stability and requires a Canon absurdly high price for its replacement part, I prefer to take a firmer Noname spare parts.