Pronto has had a plethora of issues over he years. If I can say anything they've been consistent about, it's making installers complain about them. URC has it's issues now and then, but the manufacturer is typically highly responsive and back by strong support, both within URC and from Authorized Dealers.
Honestly, the MX-900 is a great remote and many of my customers absolutely love it. The TX-1000 looks incredible, but is a little large. Due to the fact that it's larger, it should not tip over if being used on a table top. I really think you would like either of them.
If you have any questions, you are welcome to call for a free consultation.
Thank you,
Damon DG
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http://www.ProRemotes.com - Authorized Dealer & Remote Programming Services