Denver PCP shooters

Denver PCP shooters where do fill your out of date carbon fiber SCBA bottles?

I am currently filling my tank with a Yong Heng compressor. As we all know it is a Inexpensive way to fill out a date tanks. Has anybody taken the plunge to purchase one of the top-of-the-line 4500 air compressors?

Any feedback on the subject would be appreciated. I am considering purchasing one of the higher grade compressors but I would like to look at one and touch it before pulling the trigger on something that expensive.

Thanks