MarkT,
I own a gladiator, Boss, Wildcat, Impact and Crown. The Impact and Crown are feats of genius and I applaud FX for having the balls to build them. Most airgun manufacturers would not push the limits and build production guns of this complexity and quality. The Impact and crown are so well made and so precisely made and well built, I'm amazed that they can make them for what they sell them for. Each part of the gun is made of very high quality materials and the precision that they are built with is simply amazing.
If you are not a tuner, then stay away from the Impact or Crown and go to the Wildcat, Royale or Boss. Those guns are tuned specifically to the calibers they are shooting and they shoot VERY well and are very reliable if you do your part to maintain them properly.
The Impact and Crown or more for the airgun afficianado who enjoys squeezing the last bit of accuracy out of the gun and/or want to switch calibers.(This requires retuning). This being the case, the guns have more moving parts, more complex valving systems and as such are somewhat less reliable. Are they awesome?...uhh YES!!!
If I were not competing and did not enjoy the science behind these guns, and I could only have one gun? It would be my wildcat with a hugget. Stupidly accurate, mouse fart quiet, highly reliable, light, high shot count...and last but not least...looks awesome!!!
By the way, I've also owned, Umarex, Hatsan, RWS/Diana, Benjamin, and Evanix. NOTHING compares to FX. You get what you pay for!
Don't get hung up on the Impact/Crown. There are better choices for you if you are not into tuning.
Hope this helps...