I own both a Stanmore and a Woburn (recently), and I have never had a single issue with either. I've used the Stanmore literally daily for a few years as my main living room speaker for both streaming and AV-vinyl, and the sound and punch are both absolutely incredible. The price you've quoted sounds like a steal, and if it is in good shape I would internet cafe sweepstakes providers snatch that up. You might get the odd pop when it's turned up which can be startling when it happens, but small price to pay for tubes and quality.

I stream mainly from my laptop, and the only thing you may find is that for some reason mobile streaming from Spotify tends to be underpowered for some reason, although I had a similar issue streaming Spotify from my phone to a proper event hall AV system via aux cord so I wouldn't really fault the Stanmore for that.

Ultimately it is incredible sound and to be honest even my Sonos Play:1s have a hard time competing with a single Stanmore. The Sonos provide slightly crisper sound and the stereo is a clear advantage if that's important to you, but the Marshall sound is warm with deep powerful bass that easily makes up for some of the clarity loss (and I really can't stress enough that unless you're an audiophile and actually sit and compare them in an intense back and forth, you would have a hard time deciding which is better - I actually prefer the Stanmore for certain types of music).

I hope that helps and let me know if you have any questions!