Aye J.Y.Kelly,
Never ridden an XBR, but my wife had a shotty around Port Erin, when she was considering acquiring one. Enjoyed the shotty, but not that different from the Honda Bros 400 for weight, bulk etc and the 'Wee Dodger' is very smooth and handles well, so that is how she has left it. Wee Dodger is used for shopping and long runs as well, 300 mile days are no bother, you just get tired! Now up to ~75,000 miles
'Sally' is the 2nd SRX600 I've owned. The 1st, 'Gert' (1985 1JL), had open short meggas and a Powerbronze full fairing. Megga's were great, fairing was a bad idea of the previous owner as the bike corroded solid behind it!

Eventually sold 'Gert' as the spark plug was imovable. Good for shopping trips, 4 miles, commutes, 15 miles and week long trips to the south of England, 300 miles a day in appalling downpours and about 1,500 miles in a week.
'Sally' (1986 1JL) originally owned and modified by John MacDonald of this club, came home 200 miles and picked up front and back on a 632cc piston on that journey. The racket the next morning was horrendous and the bike sat in the garage for a year. Then stripped and rebuilt with new liner and 599cc Wisco piston, run in and still going well (if a little thirsty for oil now). Does everything 'Gert' did, toddles at 40mph in 4th for being nosey over the hedges, yet winds up to ~100mph if required. 55mpg overall. Lithe shape, lightweight, nimble handling, starts naye bother using the 'method' and now has over 90,000kms on the clock. Just about everything parts wise available from Yamaha dealers, WeMoto, exchanges bits from XT600's or Grizzly 600 aircooled quads. Local garage owner/MoT tester always does the test, as he likes a "wee shot!" Mods include a BSM exhaust system, K&M air filter, Koni shocks, Japanese 'Crane' rearsets, 16:39 final drive sprockets, 1987 SRX400 trispoke alloy wheels, 17" front and 18" rear, a mudflap on that short front mudgaurd (helps prevent the plugs rusting in the head or shorting out in wet conditions), rubber mini indicators as bulbs last longer. No fetching 'silly' money of XBR's, plenty new spares and the SRX400 is just as good, with better mpg I believe.
Hope this gives you a better insight. Whatever you get, enjoy riding it!

Slainte, Bill.