I have a similar experience as most users wait until the last moment, when they FRx not longer will work before changing. I do have a few who have been proactive and requested a move. A year or two ago, after sitting through 3 or 4 Summit session on SI, I thought it was too complicated for most users (and me). To Sage's credit, they have poured a lot of resources into the product over the last few years. If you buy the Designer, creating financial statements is a breeze. The user interface is 1000 times better than 2 years ago and the learning curve is 1000 times less.
Until recently, I directed the few users that wanted off of FRx to BizNet. I had BizNet perform the installation and the training, and I sat through both. It can be complicated and will definitely require (a lot of) experience to install and train professionally.
Today, I recommend SI. The product is much improved and I have been successful implementing it. I believe it will benefit everyone if I can standardize the financial reporting package.
I haven't tried RenovoFYI, and am always open to seeing what's available. I will check it out the next time the opportunity arises.