I bought a 156 from them early last year and had a great deal of problems with it.
Within a couple of weeks I had a whine coming from the car when cold. This was first diagnosed as the aux belt so this was replaced under the included warranty. This turned out to be an un-necessary job. After driving it for a bit longer I narrowed down the issue to the clutch release bearing which was also changed under warranty. Whilst they had the 'box out I asked them to pop a new clutch in and they happily obliged, charging me for the part only.
Fast forward six weeks and I had a linkage cable snap on me. This was fixed by a local garage and after the work they said the gearbox still felt very notchy but it could just be the fact the cables were new. Over the next month or so the gearbox got worse and worse and three months after my new clutch I limped home with a clutch that wouldn't release. Two days of standing on my drive and the car was stuck in neutral. Said local garage thought the clutch had been fitted incorrectly and had never been releasing correctly, just using the hydraulic system to compensate for the wear, until it had nowhere to go.
I phoned Solo Italia, knowing the car was still under their warranty (which only covers £35 an hour labour!) and they agreed to replace the clutch but I'd have to recover it to them. I live near Guildford so that was £110 but I suppose I can't really fault them
When I got there I suggested replacing the release bearing/slave cylinder again but I was told it would be un-necessary. I was then given a 200k old 146 as a courtesy car which was frankly awful. I was warned that "it smokes a bit sometimes but it's nothing to worry about". I wasn't expecting to cover two lanes of the A3 in oil smoke when I pulled off the sliproad with reasonable throttle, losing all power whilst the engine knocks and rattles! I then found that the car had a bootlid with a different lock and plenty of panels in different reds. Dodgy accident repair?
I wasn't able to speak to them when I collected my car as it was after hours due to work commitments. It all seemed
okay for a short time but then the telltale whine came back from the gearbox and it became harder and harder to get into gear when I wanted to. I assumed it would be the release bearing again but I was actually advised that the previously ruined clutch had unbalanced the flywheel, wearing the main bearing in the gearbox. Essentially I'd need a new 'box.
All of the above is factual and I don't want to give an obvious opinion that could be seen as libelous. Also, the suspicions of my local garage were unproven but suggested.
I'll let you form your own opinions from all of it
Edit- For a Fiat Coupe specialist, they only have one working one for sale! Bit odd non?