Just for balance...
Several years ago now, I saw an ad (not on BC...) for a Hiwatt amp I was keen on. Isn't it always the way; I didn't have the £600 asking price. The amp was in Kingston-on-Thames; I'm in France. Not deterred, I asked the seller if I could buy it, but pay in instalments, 3 x £200. To my surprise, he agreed. I paid using Paypal (not into his account, but his father's...), and three month's later, with Our Youngest, took the ferry to Portsmouth, then train to Basingstoke, from where my elder brother drove us to Kingston to collect it. Uber-heavy, in a new flight case, it almost had to be crow-barred into the boot of the Jaguar. Some folks can be trusted; some folks are trusting. It may be rare, but sometimes the two go together. The amp (DR205...) is now our principal bass amp. A Good Deal; it does work out, sometimes.
Just for the anecdote, the car was parked in the only space available, quite far down the road from the address. My brother stayed in the car; Our Youngest and myself went in to see the amp. The bloke had it set up in the back kitchen, with a 4x12 cab. He handed me a Telecaster, to try it out; I plucked away a few chords, testing the inputs, listening for pot crackles; it seemed fine. I handed the Tele back, and the fellow turned the master to full and hit a chord. Our son and I both jumped back a metre or so; it was loud; very, very loud. Lugging the brute out to the car, my brother, who had been quietly listening to the radio in the car the while, asked what the heck that noise had been..? That power chord had woken up half of Kingston; it was audible, and bloomin' loud, all around the block..!
No, we don't play that loud, but I'm ccomforted in the knowledge that we have 'headroom', and that it can deliver..!