Nah, they're gone Jonny - they went with Sound Control. :(
I found them really helpful - I've got a heart warming tale about their service department that was round the back.
I was sat in there waiting for them to test a mic I was having issues with - they couldn't find anything wrong, but replaced it anyway with another one to "test" at home, and told me to get back to them if there was a problem. But that's not the story...
While I was waiting, 3 young rapper types came in with a busted studio condenser mic in a carrier bag. Even from where I was sitting it looked like it had been introduced to a rhinocerous's rear end without the creature's prior permission. Their tale was "We bought it a couple of weeks ago, only done one gig, and it don't work no more..."
I thought "no chance guys..."
The Turnkey guy took it out the back, tested it, and came back. He said, "Yes, the diaphragm's broken, looks like it's had a physical shock".
They looked at him blankly.
"You know this is a studio mic really, it should be handled really carefully otherwise you'll break the diaphragm. It's not a hand-held mic. Looks to me like you might've dropped it?"
"No mate, we're always really careful..."
He knew they were lying, as did everyone listening. He let them sweat it for half a minute, for it to sink in, the enormity of what they'd done to this fine instrument... until they knew he didn't actually believe them... and then he replaced it anyway!!!
I couldn't believe it. But I thought about it afterwards. It wasn't a seriously expensive model (nor was mine, but mine was at least twice as much), he'd managed to scare them into taking care of their mics a bit better, he'd let them know he didn't believe their story, and then he gave them what they needed anyway. Who knows whether they're going to get successful and need more gear, but they'd be guaranteed to come back next time...
Except, the place is gone now...
I never got that sort of service out of Sound Control, but the London Turnkey guys were pretty good.
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On the "trying" question, apart from when you get some idiot salesperson, I've always found that the decent guys/gals can "smell" money. If I've got a budget behind me, maybe not for spending right now, but I'm actually looking at buying something in the near future, then they can sense I'm serious and they'll let me touch anything.
The internet shopping has changed things slightly, and I know they're sensitive, so I'm upfront about "I don't want to buy on the internet, but I am comparing you to the bloke up the road". If they can't hack the second bit, and some don't seem to be able to, then I'm less likely to be well-disposed towards them. I even seem to get away with "I'm not buying now, but can I try your wot-ever-it-is".
I'm reallly glad I'm not running a music shop though, having to tread this fine line between protecting the stock and nurturing potential customers.