We use Concur at work and it's pretty painless. I scan most of my receipts with the app, usually in one big batch at the airport while I'm waiting around, do cleanup the next day (taxi/uber fare or parking receipts from the airport or whatever), and the reimbursement is included on my 2nd next paycheck at latest, which is direct-deposited anyway.
Maybe the incumbents are good for the enterprise and Abacus is for small/medium business?