Quote: As long as you're slightly vague about the details that it was performed by the Shawdale String-And-Barbershop Quartet And Variety Show, you then have automatic credibility.
What's the saying, you don't sell the "steak" but the "sizzle"
Quote: It's one of the most amazing experiences; even if you're not that happy with the piece, the bassoonist hates his part, and the ensemble is a little under-rehearsed, it's still YOURS.
I have to add one caveat, while I'm sure nothing compares to the sense of fulfillment a good performance of your music can bring, I don't know that anything equals the disappointment of having a piece that you slaved over butchered by a poor performance.
When I was at Berklee, in one of my first Film Scoring classes I had to compose a short intro for some nature show and then go to the studio to conduct and record it to picture with live players. I wrote pretty simple music and used a small ensemble of maybe 7 or 8 players thinking that would give me the best shot at a good performance. I booked all the musicians from the session call list they kept in the department, most of whoms listing was mandatory due to scholarship obligations, and despite being nervous about my conducting abilites, I was pretty excited about getting a solid recording of some of my music.
Most of the players were late and all looked like they'de rather be anywhere than reading through parts with a novice conductor with his grade on the line (in their defense, it was finals week). Then when my first violinist, who had most of the melodic material, showed up almost 15 minutes into my 55 minute session, she was empty-handed. She explained that her violin had been taken to the wrong luthier by her roomate or something and she couldn't get it in time for the session, but she wanted to tell me in person. That really meant the world to me with a ticking clock and a ragtag group of players who could barely stay awake.
Needless to say, the session was nightmare and I disposed of the recording as soon as left the mixing room. I don't blame the players, I was in the same boat being obligated to perform on sessions as a bassist for the Jazz Comp department despite the fact I could barely read nursery rhymes in whole notes with no metronome. Luckily the only sessions I got roped into were more chart reading and improvisation, but I still hated the idea of being the guy that ruined someone else's piece.
I did learn one valuable lesson though, having players who care about the music and the performance, whether it's because they like your music, you agreed to pay them scale or a 12-pack, or because they owed you, is more important than whatever ink you put on the pages. If you're the only one in the room who gives a shit, you maybe better off deferring to VSL or EWQLSO and a good deal of programming.