[Amps] Why hasn't solid state replaced tubes?

[Zyg Skrobanski]

How about the Icom IC-PW1 solid state amplifier?

>From the Icom Website (http://www.icomamerica.com/amateur/index2.html)
Output power: 
CW, RTTY: 1 kW at 180 - 264 V AC; 500 W at 90 - 132 V AC input 
SSB 1 kW PEP at 180 - 264 V AC; 500 W PEP at 90 - 132 V AC input 
Driving power: Max. 100 W 
Spurious emissions: 
Less than -60 dB (HF bands) 
Less than -50 dB (50 MHz) 

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Zyg AF4MP
Roswell GA USA